Chains and heterogens:
PDB Chain Sequences:
>3pxlA (A:) avgpvadltitdaavspdgfsrqavvvngvtpgplvagnigdrfqlnvidnltnhtmlks tsihwhgffqhgtnwadgpafinqcpispghsflydfqvpdqagtfwyhshlstqycdgl rgpfvvydpndphasrydvdnddtvitladwyhtaaklgprfpggadatlingkgrapsd svaelsvikvtkgkryrfrlvslscnpnhtfsidghnltiievdsvnsqplevdsiqifa aqrysfvldanqavdnywiranpnfgnvgfdgginsailrydgapavepttnqttsvkpl nevdlhplvstpvpgapssggvdkainmafnfngsnffingasfvpptvpvllqilsgaq taqdllpsgsvyvlpsnasieisfpataaapgaphpfhlhghtfavvrsagstvynydnp ifrdvvstgtpaagdnvtirfdtnnpgpwflhchidfhleggfavvmaedtpdvkavnpv pqawsdlcptydaldpndq