Chains and heterogens:
PDB Chain Sequences:
>1a2j_ (-) aqyedgkqyttlekpvagapqvleffsffcphcyqfeevlhisdnvkkklpegvkmtkyh vnfmggdlgkdltqawavamalgvedkvtvplfegvqktqtirsasdirdvfinagikge eydaawnsfvvkslvaqqekaaadvqlrgvpamfvngkyqlnpqgmdtsnmdvfvqqyad tvkylsek