>3tvrA (A:) observed residues (from ATOM records)
hhhhssglvprghmaghtdneitiaapmelvwnmtndiekwpglfseyasvevlgrdddk
vtfrltmhpdadgkvwswvservadpvtrtvraqrvetgpfqymnivweyaetaegtvmr
wtqdfamkpdapvddawmtdninrnsrtqmalirdrieqaagerrtasvlad