<div dir="ltr">Regarding first the example here: <div><br></div><div><a href="https://biopython.org/docs/1.75/api/Bio.PDB.Polypeptide.html">https://biopython.org/docs/1.75/api/Bio.PDB.Polypeptide.html</a><br><br>How can I get the chain id for every pp? </div></div>