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Genetic analysis and studies of normal and leukemia cells in culture have shown that Abl family nonreceptor tyrosine kinases regulate cell morphogenesis and motility. Abl family kinases, which include Drosophila (D-) Abl and the vertebrate Abl and Arg proteins, relay signals from cell surface growth-factor and adhesion receptors to promote cytoskeletal rearrangements. Recent biochemical and crystallographic...