Chains and heterogens:
PDB Chain Sequences:
>1a40A (A:) easltgagatfpapvyakwadtyqketgnkvnyqgigssggvkqiiantvdfgasdapls deklaqeglfqfptviggvvlavnipglksgelvldgktlgdiylgkikkwddeaiakln pglklpsqniavvrradgsgtsfvftsylakvneewknnvgtgstvkwpiglggkgndgi aafvqrlpgaigyveywyakqnnlaytklisadgkpvspteenfanaakgadwsktfaqd ltnqkgedawpitsttfilihkdqkkpeqgtevlkffdwayktgakqandldyaslpdsv veqvraawktnikdssgkply