>4pv1B (B:) observed residues (from ATOM records)
atlkkpdlsdpklraklakgmghnyygepawpndllyvfpvvimgtfacivalsvldpam
vgepadpfatpleilpewylypvfqilrsvpnkllgvllmasvplglilvpfienvnkfq
npfrrpvattiflfgtlvtiwlgigatfpldktltlglf