>4u3sB (B:) observed residues (from ATOM records)
gttvsgyinpdfvttsttapivkagftveivgttksavtdsngyfeikdvaagtytvkit
kanyltreianvsvtadkelstsaspilmwagdmaiggtqdgainledileickafgtss
tdakyqvgldlnrdgaisledvmivakhfnkvssdy