Chains and heterogens:
PDB Chain Sequences:
>1ast_ (-) aailgdeylwsggvipytfagvsgadqsailsgmqeleektcirfvprttesdyveifts gsgcwsyvgrisgaqqvslqangcvyhgtiihelmhaigfyhehtrmdrdnyvtinyqnv dpsmtsnfdidtysryvgedyqyysimhygkysfsiqwgvletivplqngidltdpydka hmlqtdanqinnlytnecsl