1. Department of Physics, University of Wisconsin−Madison, 1150 University Avenue, Madison, Wisconsin 53706, Center for Biomolecular Materials Spectroscopy, Laboratory for Chemical Physics, New York University, 345 E. 24th Street, New York, New York 10010, Deptartment of Biomineralization, The Forsyth Institute, 140 The Fenway, Boston, Massachusetts 02115-3799, Department of Molecular and Cell Biology, University of California−Berkeley, Berkeley, California 94720-3200, Synchrotron Radiation Center, 3731...