Chains and heterogens:
PDB Chain Sequences:
>3s4xA (A:) tpvsekqlaevvantvtplmkaqsvpgmavaviyqgkphyytfgkadiaankpvtpqtlf elgsisktftgvlggdaiargeislddpvtrywpqltgkqwqgirmldlatytagglplq vpdevtdnasllrfyqnwqpqwkpgttrlyagasiglfgalavkpsgmpyeqamttrvlk plkldhtwinvpkaeeahyawgyrdgkavrvspgmldaqaygvktnvqdmanwvmanmap envadaslkqgialaqsrywrigsmyqglgwemlnwpveantvvegsdskvalaplpvve vnppappvkaswvhktgstggfgsyvafipekqigivmlantsypnparveaayhileal qhhhhhh