>1xz3A (A:) observed residues (from ATOM records)
sqirqnysteveaavnrlvnlylrasytylslgfyfdrddvalegvchffrelaeekreg
aerllkmqnqrggralfqdlqkpsqdewgttldamkaaivlekslnqalldlhalgsaqa
dphlcdfleshfldeevklikkmgdhltniqrlvqaglgeylferltl