1. Department of Chemical and Biological Engineering (J.C.G., B.A.A., B.J.V., C.L.A., A.G.-R., F.M.Y., K.S.A.), University of Colorado Boulder, Boulder.
2. BioFrontiers Institute (J.C.G., B.A.A., D.B., M.E.S., A.G.-R., F.M.Y., K.S.A.), University of Colorado Boulder, Boulder.
3. Division of Biochemistry (D.B.), University of Colorado Boulder, Boulder.
4. Materials Science and Engineering Program (M.E.S., K.S.A.), University of Colorado Boulder, Boulder.
5. Department of Internal Medicine, University of Iowa, Iowa City (R.M.W.).