Chains and heterogens:
PDB Chain Sequences:
>1a55A (A:) easltgagatfpapvyakwadtyqketgnkvnyqgigssggvkqiiantvdfgasdapls deklaqeglfqfptviggvvlavnipglksgelvldgktlgdiylgkikkwddeaiakln pglklpsqniavvrradgsgtsfvftsylakvneewknnvgtgstvkwpiglggkgndgi aafvqrlpgaigyveycyakqnnlaytklisadgkpvspteenfanaakgadwsktfaqd ltnqkgedawpitsttfilihkdqkkpeqgtevlkffdwayktgakqandldyaslpdsv veqvraawktnikdssgkply