Chains and heterogens:
PDB Chain Sequences:
>1a4h_ (-) masetfefqaeitqlmsliintvysnkeiflrelisnasdaldkirykslsdpkqletep dlfiritpkpeqkvleirdsgigmtkaelinnlgtiaksgtkafmealsagadvsmigqf gvgfyslflvadrvqvisksnddeqyiwesnaggsftvtldevnerigrgtilrlflkdd qleyleekrikevikrhsefvaypiqlvvtkeve