Hi there, <div><br></div><div>Have a look at the documentation of that method. There is a 'standard' optional argument that allows you to control just that. </div><div><br></div><div><a href="http://biopython.org/DIST/docs/api/Bio.PDB.Polypeptide-module.html">http://biopython.org/DIST/docs/api/Bio.PDB.Polypeptide-module.html</a></div><div><br></div><div>Cheers, </div><div><br></div><div>João <br><div dir="auto"><div dir="auto"><br><div class="gmail_quote"><div dir="ltr">A terça, 17/07/2018, 21:41, Ahmad Khalifa <<a href="mailto:underoath006@gmail.com">underoath006@gmail.com</a>> escreveu:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hello,<div><br></div><div>I have the following code:</div><div><br></div><div><div>from Bio.PDB import Polypeptide</div><div><br></div><div>residue</div><div>Out[17]: <Residue GDP het=H_GDP resseq=430 icode= ></div><div><br></div><div>Polypeptide.is_aa(residue)</div><div>Out[18]: True</div></div><div><br></div><div>Why is it True? How can I return True just for standard amino acids?</div><div><br></div><div>Regards. </div></div>
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