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Document<br />

Figure 3<br />

(a) A MOLSCRIPT [107] stereo diagram of the neuraminidase tetramer viewed<br />

from above down the symmetry axis. The different shaded arrows represent β<br />

strands comprising the six β sheets that form the “propeller” framework of<br />

each subunit. (b) A stereo diagram of a neuraminidase monomer viewed down<br />

the 4-fold axis, and α-sialic acid is shown bound in the active site<br />

of the enzyme, which lies in a pocket formed <strong>by</strong> the six β<br />

sheets near the pseudo six-fold axis of each subunit.<br />

http://legacy.netlibrary.com/nlreader/nlReader.dll?bookid=12640&filename=Page_466.html (1 of 2) [4/9/2004 12:15:39 AM]<br />

Page 466

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