>1sz3A (A:) observed residues (from ATOM records) mehderthvpvelraagvvllnergdillvqekgipekaglwhipsgavedgenpqdaav reaceetglrvrpvkflgaylgrfpdgvlilrhvwlaepepgqtlapaftdeiaeasfvs redfaqlyaagqirmyqtklfyadalrekgfpalp