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John M. S. Bartlett.pdf - Bio-Nica.info

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Solid-Phase Minisequencing 365<br />

8. Release the detection step primer from the template by adding 60 µL of 50 mM NaOH and<br />

incubating for 3 min at room temperature.<br />

9. Transfer the eluted primer to the scintillation vials, add scintillation reagent, and measure<br />

the radioactivity, that is, the amount of incorporated label, in a liquid scintillation counter<br />

(see Note 9).<br />

10. The result is obtained as counts per minute (cpm) values. The cpm value of each reaction<br />

expresses the amount of the incorporated [ 3 H] dNTP. Calculate the ratio (R) between the<br />

mutant and normal nucleotide cpms. In a sample of a subject homozygous for the mutant<br />

nucleotide the R will be >10, in a homozygote for the normal nucleotide R

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