Chains and heterogens:
PDB Chain Sequences:
>4x3cA (A:) dhsellvntksgkvmgtrvpvlsshisaflgipfaeppvgnmrfrrpepkkpwsgvwnas typnncqqyvdeqfpgfsgsemwnpnremsedclylniwvpsprpksttvmvwiygggfy sgsstldvyngkylayteevvlvslsyrvgafgflalhgsqeapgnvglldqrmalqwvh dniqffggdpktvtifgesaggasvgmhilspgsrdlfrrailqsgspncpwasvsvaeg rrravelgrnlncnlnsdeelihclrekkpqelidvewnvlpfdsifrfsfvpvidgeff ptslesmlnsgnfkktqillgvnkdegsffllygapgfskdseskisredfmsgvklsvp handlgldavtlqytdwmddnngiknrdglddivgdhnvicplmhfvnkytkfgngtyly ffnhrasnlvwpewmgvihgyeiefvfglplvkelnytaeeealsrrimhywatfaktgn pnephsqeskwplfttkeqkfidlntepmkvhqrlrvqmcvfwnqflpkllnat