>3h21A (A:) observed residues (from ATOM records)
kwdydlrcgeytlnlnektlimgilnvtpdsfsdggsynevdaavrhakemrdegahiid
iggsveeeikrvvpmiqavskevklpisidtykaevakqaieagahiindiwgakaepki
aevaahydvpiilmhnrdnmnyrnlmadmiadlydsikiakdagvrdeniildpgigfak
tpeqnleamrnleqlnvlgypvllgtsrksfighvldlpveerlegtgatvclgiekgce
fvrvhdvkemsrmakmmdamigk