>1xr3B (B:) observed residues (from ATOM records)
matqdsevalvtgatsgigleiarrlgkeglrvfvcargeeglrttlkelreagveadgr
tcdvrsvpeiealvaavverygpvdvlvnnagrpgggataeladelwldvvetnltgvfr
vtkqvlkaggmlergtgrivniastggkqgvvhaapysaskhgvvgftkalglelartgi
tvnavcpgfvetpmaasvrevsteeafdritarvpigryvqpsevaemvayligpgaaav
taqalnvcgglgny