>4y28F (F:) observed residues (from ATOM records) sgltpckeskqfakrekqsikklesslkiyaadsapalainatiektkrrfdnyakqgll cgadglphlivsgdqrhwgefitpgilflyiagwigwvgrsyliairdekkptqkeiiid vplasrlvfrgfswpiaayrellngelvak