>2retD (D:) observed residues (from ATOM records)
qertarlnelqralvmmdsdfrqialrqtrtkkllhwadylldsdnkgimfarlgwhnpq
qqfprgevtkvgyrikderlervwwrypdtpqegvvtpllsdveelnvrfydgkqwinew
sneltlpaaisveltlkdygkiartyltpegnlqk