>4p18Q (Q:) observed residues (from ATOM records)
vsqvrqnyhsdceaavnrmlnlelyasytyssmyaffdrddvalhnvaeffkehsheere
haekfmkyqnkrggrvvlqkikkperdewgntleamqaalqlektvnqalldlhklatdk
vdphlcdfleseyleeqvkdikrigdfitnlkrlglpengmgeylfdkhsvk