>3rt3B (B:) observed residues (from ATOM records)
wdltvkmlagnefqvslsssmsvselkaqitqkigvhafqqrlavhpsgvalqdrvplas
qglgpgstvllvvdksdeplsilvrnnkgrsstyevrltqtvahlkqqvsglegvqddlf
wltfegkpledqlplgeyglkplstvfmnlrlr