1. Department of Biological Sciences, Dartmouth College, Hanover, New Hampshire 03755 (I.H.S., S.A., Y.Z., A.R., X.W., G.E.S.); Department of Biochemistry, Quaid-i-azam University, Islamabad 45320, Pakistan (S.A., A.R., S.N.S.); and Department of Biology, University of North Carolina, Chapel Hill, North Carolina 27599 (J.J.K.)