Chains and heterogens:
PDB Chain Sequences:
>1a1s_ (-) vvslagrdllclqdytaeeiwtiletakmfkiwqkigkphrllegktlamifqkpstrtr vsfevamahlgghalylnaqdlqlrrgetiadtarvlsryvdaimarvydhkdvedlaky atvpvinglsdfshpcqaladymtiwekkgtikgvkvvyvgdgnnvahslmiagtklgad vvvatpegyepdekvikwaeqnaaesggsfellhdpvkavkdadviytdvwasmgqeaea eerrkifrpfqvnkdlvkhakpdymfmhclpahrgeevtddvidspnsvvwdqaenrlha qkavlalvmggik