Chains and heterogens:
PDB Chain Sequences:
>1a2n_ (-) mdkfrvqgptklqgevtisgaknaalpilfaallaeepveiqnvpklkdvdtsmkllsql gakverngsvhidardvnvfcapydlvktmrasiwalgplvarfgqgqvslpggatigar pvdlhisgleqlgatikleegyvkasvdgrlkgahivmdkvsvgatvtimcaatlaegtt iienaarepeivdtanflitlgakisgqgtdriviegverlgggvyrvlpdrietgtflv aaaisrgkiicrnaqpdtldavlaklrdagadievgedwisldmhgkrpkavnvrtaphp afptdmqaqftllnlvaegtgfitetvfenrfmhvpelsrmgahaeiesntvichgvekl sgaqvmatdlrasaslvlagciaegttvvdriyhidrgyeriedklralganiervkg