Chains and heterogens:
PDB Chain Sequences:
>1m4wA (A:) dttitqnqtgydngyfysfwtdapgtvsmtlhsggsystswrntgnfvagkgwstggrrt vtynasfnpsgnayltlygwtrnplveyyiveswgtyrptgtykgtvttdggtydiyetw rynapsiegtrtfqqfwsvrqqkrtsgtitignhfdawaragmnlgshdyqimategyqs sgsstvsiseggnpgnp