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Sequencing Difficult Templates 401 58 Technical Notes for Sequencing Difficult Templates David Stirling 1. Introduction There are a number of template types that are generally recognized as being difficult to sequence. These can include sequences with a high guanine–cytosine (G/C) content, sequences that are very rich in adenine/thymine (A/T), sequences with a marked secondary structure, or large regions of homopolymer. There is no one solution to these difficulties; however, there are a number of approaches that can be used to improve the quality of sequencing data obtained from each type of problem sequence. 2. High G/C Content Sequences with high G/C content have higher melting temperatures, and the incorporation of the dye-labeled terminators is also less efficient. The addition of DMSO to a final concentration (v/v) of 5% or betaine (final concentration of 1 M ) to cycle sequencing reactions can greatly improve results. Changing the cycling conditions to use a higher melting temperature can help, as can the use of altered sequencing chemistry. Applied Biosystems produce a dGTP Big Dye kit where dITP normally used in big dye chemistry is replaced with dGTP. Adding more Taq and dNTPs can also help. 3. A/T-Rich Sequences A / T-rich sequences are generally not as difficult as G/C-rich templates. A /T-rich primers will have low melting temperatures and so may need to be longer (24–26 bases) to increase the melting temperature closer to 55°C. Dye primer sequencing is generally more even through A /T regions. 4. Secondary Structure Sudden loss of sequencing data generally indicates a problem with secondary structure. Where there are runs of Gs followed by runs of Cs, for instance, hairpin loops can form, impeding the progress of the polymerase and resulting in a stop in the data. Any of the approaches suggested for high G/C content sequences can be used. From: Methods in Molecular Biology, Vol. 226: PCR Protocols, Second Edition Edited by: J. M. S. Bartlett and D. Stirling © Humana Press Inc., Totowa, NJ 401
402 Stirling 5. Homopolymer Regions Enzyme slippage can occur when a run of the same bases occur consecutively (sometimes less than 10 for G and C). One solution is to use an anchored primer. This consists of a string of the repeated base, followed by a degenerate 3′ position of the other three bases. This allows the sequence to be resumed after the homopolymer but gives no information regarding the number of bases in the repeat. Designing a primer 30 to 40 bases from the start of the homopolymer and increasing the Taq concentration can improve the chances of reading through the homopolymer.
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Xin Wang and W. Scott Young III 105
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63. Primed In Situ Nucleic Acid Lab
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4 Bartlett and Stirling The thing t
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6 Bartlett and Stirling Fig. 2. Res
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8 Carroll and Casimir of PCR. Such
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10 Carroll and Casimir cost more th
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12 Carroll and Casimir are no longe
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16 McDonagh Fig. 1. Unidirectional
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18 McDonagh stored. This means that
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22 Stirling which will either not a
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24 Stirling
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28 Bartlett References 1. US Depart
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30 Bartlett and White 11. 5 M sodiu
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32 Bartlett and White
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34 Pearson and Stirling 11. Microfu
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36 Going 3. Methods 3.1. Section Cu
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38 Going pipet filler. Spread the p
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40 Going digitally to record the di
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42 Going
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44 Pearson 7. Add 60 µL of chlorof
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46 Bartlett 3. Methods 3.1. RNA Ext
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48 Pearson 3. Method The method of
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50 Stirling and Bartlett 4. Protein
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52 Stirling and Bartlett
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54 Stirling 3. Methods 3.1. Fungal
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56 McDonagh 2. Add 0.4 mL of TNE bu
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58 Schmerer 2. Materials To apply t
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60 Schmerer 3. The additional purif
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64 Stirling
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66 Bartlett Table 1 Recommended Aga
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68 Bartlett Table 2 Separation of D
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70 Bartlett 2. 5× TBE: 54 g of Tri
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72 Bartlett 7. Remove upper aqueous
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74 Bartlett 4. Many modern electrop
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76 Bartlett
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78 Stirling 11. Store at -20°C for
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82 Hyndman and Mitsuhashi 3.1. Effi
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84 Hyndman and Mitsuhashi Fig. 1. H
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86 Hyndman and Mitsuhashi Fig. 3. H
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88 Hyndman and Mitsuhashi can be ge
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90 Grunenwald may be affected by ea
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92 Grunenwald 50°C will generally
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94 Grunenwald of template DNA, a su
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96 Grunenwald than absolutely neces
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98 Grunenwald 2. Foord, O. S. and R
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102 Stirling Table 1 Thermal Cycler
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104 Stirling
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106 Wang and Young full-length cDNA
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108 Wang and Young Fig. 1. (A) Nort
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110 Wang and Young Fig. 3. Expresse
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112 Wang and Young 2. First-strand
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114 Wang and Young 3′-RACE outlin
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116 Wang and Young
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118 Dassanayake and Samaranayake co
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120 Dassanayake and Samaranayake 5.
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122 Dassanayake and Samaranayake Re
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124 Iannone et al. Fig. 1. Diagram
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Table 1 Oligonucleotides Descriptio
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128 Iannone et al. 5. For microsphe
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130 Iannone et al. 4. To adjust for
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132 Iannone et al. 6. Target concen
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134 Iannone et al.
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136 Benjamin, Smith, and Waites amp
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138 Benjamin, Smith, and Waites the
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140 Benjamin, Smith, and Waites 2.2
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142 Benjamin, Smith, and Waites 2.
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148 Benjamin, Smith, and Waites 8.
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150 Benjamin, Smith, and Waites
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152 Olmos et al. Fig. 1. RT-hemines
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154 Olmos et al. This nested RT-PCR
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156 Olmos et al. Table 2 Volume and
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158 Olmos et al. 8. The sensitivity
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160 Olmos et al.
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162 Abe 5. Moloney murine leukemia
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164 Abe Table 2 Detection Rate of H
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166 Abe 4. For HBV, nested PCR usin
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168 Tellier et al. of Pfu (and ther
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170 Tellier et al. 2. Cline, J., Br
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172 Tellier et al. 38. Tamiya, S.,
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174 Tellier et al. 13. Thin-wall PC
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176 Tellier et al. 13 min for the l
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178 Tellier et al.
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182 Stirling efficiency of the reac
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184 Stirling
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186 Cremer and Moos Fig. 1. Rearran
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188 Cremer and Moos 4. Count cells
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196 Cremer and Moos 11. Klein, E.,
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198 McDonagh the dilution method is
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200 McDonagh 2.2. Basic PCR 1. dNTP
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202 McDonagh Fig. 2. Quantitative P
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204 McDonagh
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206 Bartlett Table 1 Example Assay
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208 Bartlett 3.4. Calculation of Re
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210 Bartlett 11. Cerenkov counting
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212 Kerr Fig. 1. Fluorescent probes
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214 Kerr after the PCR. This reduce
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218 Bartlett As with any experiment
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220 Bartlett Even once novel regula
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222 Bartlett Notwithstanding these
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224 Bartlett
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226 Dominguez et al. Table 1 Primer
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230 Dominguez et al. Fig. 2. cDNA n
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232 Dominguez et al. 3.4. Gel Elect
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236 Dominguez et al. 11. Joshi, C.
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238 Khalturin, Kuznetsov, and Bosch
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246 Ringquist et al. In this chapte
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252 Ringquist et al. 2. The present
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256 Case-Green, Pritchard, and Sout
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272 Oien Fig. 1. A schematic diagra
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274 Oien 4. 100% and 70% ethanol. 5
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278 Oien 50-mL conical tubes. Resus
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280 Oien Forward Primer, and then r
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282 Oien 8. PCR. With SAGE, achievi
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288 Edwards and Bartlett technology
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290 Edwards and Bartlett ing less p
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292 Edwards and Bartlett Stepwise m
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294 Edwards and Bartlett
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296 Rithidech and Dunn 11. Ethidium
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298 Rithidech and Dunn Fig. 1. PCR
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308 Edwards and Bartlett 3. Sartor,
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310 Schmerer the investigation conc
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312 Schmerer References 1. Kunkel,
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318 Aubele and Smida References 1.
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320 Nakashima, Akahoshi, and Tanaka
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324 Stirling 9. TAE (20×): 484 g o
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326 Stirling
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328 Han and Robinson Fig. 1. Basic
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330 Han and Robinson sequence diffe
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334 Han and Robinson
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338 Stirling of simple and improved
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340 Stirling concentrations interfe
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342 Daniels to sequence a 500-bp PC
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344 Daniels 4. Load all of the samp
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346 Daniels References 1. Orita, M.
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348 Kösel et al. Fig. 1. Schematic
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454 Speel, Ramaekers, and Hopman of
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456 Speel, Ramaekers, and Hopman Fi
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458 Speel, Ramaekers, and Hopman 3.
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460 Speel, Ramaekers, and Hopman 4.
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462 Speel, Ramaekers, and Hopman bu
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468 Pearson and Stirling into PCR p
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470 Wang 2. Materials 2.1. PCR 1. D
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472 Wang Fig. 1. A brief outline of
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474 Wang
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476 Horton, Raju, and Conti-Fine Fi
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478 Horton, Raju, and Conti-Fine th
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480 Horton, Raju, and Conti-Fine 1.
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482 Horton, Raju, and Conti-Fine ot
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484 Horton, Raju, and Conti-Fine
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486 Preston amplification approach
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488 Preston 1. 10× PCR buffer: 100
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490 Preston Fig. 1. Design of degen
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492 Preston 2. Remove the AmpliTaq
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494 Preston 3.3. Cloning and DNA Se
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496 Preston MgCl 2 concentrations b
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498 Preston 21. Hung, T., Mak, K.,
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500 Ravassard et al. Fig. 1. Constr
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502 Ravassard et al. size dispersio
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504 Ravassard et al. 9. ddH 2 O. 10
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506 Ravassard et al. 3.2.2. RNA Mix
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508 Ravassard et al. 4. Wash twice
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510 Ravassard et al.
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512 Pont-Kingdon Fig. 1. Constructi
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514 Pont-Kingdon 9. Invert tube and
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516 Pont-Kingdon
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518 Jones and Winistorfer Fig. 1. D
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520 Jones and Winistorfer Fig. 2. D
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522 Jones and Winistorfer The yield
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524 Jones and Winistorfer 7. Goulde
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526 Burke and Barik Fig. 1. The bas
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528 Burke and Barik concentration o
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530 Burke and Barik purified mutant
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532 Burke and Barik
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