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I'm not sure I understand the concept of individual selection when
doing composite OMIT map. The whole purpose of composite OMIT map is
to do iterative omits and then put the entire mosaic back into full
map so that each region of the map is "omit". This way you are
expecting to get a less biased map that this map also may appear of
a lesser quality.<br>
<br>
It depends what question you are trying to answer. If you the
question is to prove the presence of a ligand then simply compute
Polder map:<br>
<br>
<a class="moz-txt-link-freetext" href="http://journals.iucr.org/d/issues/2017/02/00/ba5254/ba5254.pdf">http://journals.iucr.org/d/issues/2017/02/00/ba5254/ba5254.pdf</a><br>
<a class="moz-txt-link-freetext" href="https://www.youtube.com/channel/UCcdI0hfHngWAZLJWynxPQWg/videos">https://www.youtube.com/channel/UCcdI0hfHngWAZLJWynxPQWg/videos</a><br>
<br>
Pavel <br>
<br>
<div class="moz-cite-prefix">On 6/3/17 19:48, Sam Tang wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAEVN0EdEVLp=3_OPAK6bnkPQuos0avsT_rEQrT3BRw5A6NkAPg@mail.gmail.com">
<div dir="ltr">Dear all
<div><br>
</div>
<div>Sorry for a very basic question about generating an omit
map.</div>
<div><br>
</div>
<div>I am trying to generate a SA-omit map for only my ligand
but not the protein core of my complex. I presume I can use
phenix.composite_omit_map GUI and specify my ligand chain in
Atom Selection? </div>
<div><br>
</div>
<div>All other parameters being the same, I notice that when I
did not select any atom the whole structure was divided to
30-40 regions but when I selected my ligand chain it now
divides into 89 regions. Is there a reason why and is there
any advantage to manually adjust the number of omit regions?</div>
<div><br>
</div>
<div>Many thanks and regards</div>
<div><br clear="all">
<div>
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<div style="font-size:12.7272720336914px"><font
color="#000000">Sam </font></div>
<div style="font-size:12.7272720336914px"><font
color="#000000">Biochemistry Programme, School of
Life Sciences, CUHK</font></div>
<div style="font-size:12.7272720336914px"><br>
</div>
</div>
</div>
</div>
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