>4kthB (B:) observed residues (from ATOM records)
ieggwqgmvdgwygyhhsneqgsgyaadkestqkaidgvtnkvnsiidkmntqfeavgre
fnnlerrienlnkkmedgfldvwtynaellvlmenertldfhdsnvrnlydkvrlqlkdn
akelgngcfefyhkcdnecmesvrngtydypqyseearlkreeis