passages.id: 1.0alpha7.train.484.sent
passages.type: sentence
passages.text:  An N-terminal  proline-rich  sequence (PXXP) binds to  Nck (Bokoch et al., 1996   ;  Galisteo et  al., 1996   ); a CRIB (  Cdc42/ Rac  interactive  binding) motif binds to  GTP-bound forms  of  Cdc42 and  Rac (Manser et al., 1994   ;  Burbelo et  al., 1995   ); and a  proline-rich motif is constitutively bound to  Pix, a   guanine nucleotide exchange factor specific to  Rac and  Cdc42 (Manser et al.,  1998   ).  
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