>3k69A (A:) observed residues (from ATOM records)
mkldfsvavhsilyldahrdskvasrelaqslhlnpvmirnilsvlhkhgyltgtvgkng
gyqldlaladmnlgdlydltipptisyarfitgpskadqspiaanisetltdlftvadrq
yrayyhqftmadlqadlnhhgtflqheqdse