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Profile of Daniel J. Cosgrove

Since that time, Cosgrove has moved from cucumber seedlings to maize pollen and from enzyme assays to crystallography, all in an effort to determine how expansins work their magic. In his Inaugural Article in this issue of PNAS, Cosgrove, currently the Eberly Family Chair in Biology at Pennsylvania State University (Penn State, State College, PA), presents the crystal structure of EXPB1, an expansin from maize pollen, and its surprisingly long binding groove that spans two domains of the 27-kDa protein (2).