Chains and heterogens:
PDB Chain Sequences:
>1fsfA (A:) mrliplttaeqvgkwaarhivnrinafkptadrpfvlglptggtpmttykalvemhkagq vsfkhvvtfnmdeyvglpkehpesyysfmhrnffdhvdipaeninllngnapdidaecrq yeekirsygkihlfmggvgndghiafnepasslasrtriktlthdtrvansrffdndvnq vpkyaltvgvgtlldaeevmilvlgsqkalalqaavegcvnhmwtisclqlhpkaimvcd epstmelkvktlryfneleaenikgl