Chains and heterogens:
PDB Chain Sequences:
>1t2xA (A:) asapigsaisrnnwavtcdsaqsgnecnkaidgnkdtfwhtfygangdpkpphtytidmk ttqnvnglsmlprqdgnqngwigrhevylssdgtnwgspvasgswfadsttkysnfetrp aryvrlvaiteangqpwtsiaeinvfqassytapqpglgrwgptidlpivpaaaaiepts grvlmwssyrndafggspggitltsswdpstgivsdrtvtvtkhdmfcpgismdgngqiv vtggndakktslydsssdswipgpdmqvargyqssatmsdgrvftiggswsggvfeknge vyspssktwtslpnakvnpmltadkqglyrsdnhawlfgwkkgsvfqagpstamnwyyts gsgdvksagkrqsnrgvapdamsgnavmydavkgkiltfggspdyqdsdattnahiitlg epgtspntvfasnglyfartfhtsvvlpdgstfitggqrrgipfedstpvftpeiyvpeq dtfykqnpnsivrvyhsislllpdgrvfngggglcgdcttnhfdaqiftpnylynsngnl atrpkitrtstqsvkvggritistdssiskaslirygtathtvntdqrripltltnnggn sysfqvpsdsgvalpgywmlfvmnsagvpsvastirvtq