>1tu4D (D:) observed residues (from ATOM records)
nkicqfklvllgesavgksslvlrfvkgqfhestigaafltqtvclddttvkfeiwdtag
qeryhslapmyyrgaqaaivvyditneesfaraknwvkelqrqaspnivialsgnkadla
nkravdfqeaqsyaddnsllfmetsaktsmnvneifmaiakklp