>4u2uB (B:) observed residues (from ATOM records)
mseeqvaqdteevfrsyvfyrhqqeqestmgqvgrqlaiigddinrrydsefqtmlqhlq
ptaenayeyftkiatslfesginwgrvvallgfgyrlalhvyqhgltgflgqvtrfvvdf
mlhhsiarwiaqrggwvaaln