Chains and heterogens:
PDB Chain Sequences:
>1fx4A (A:) dndsapkeptgpvtliftdiesstalwaahpdlmpdavathhrlirslitryecyevktv gdsfmiaskspfaavqlaqelqlcflrldwetnavdesyrefeeqraegeceytpptasl dpevysrlwnglrvrvgihtglcdirydevtkgydyygrtsnmaartesvanggqvlmth aaymslsgedrnqldvttlgatvlrgvpepvrmyqlnavpgrnfaalrldr