CRK (CT10 Regulator of Kinase) is composed of one SH2 and one or two SH3 domains. This adaptor protein binds with phosphorylated tyrosine motifs found in proteins involved in cell spreading, actin reorganisation, and cell migration. Paxillin (PAX) and p130CAS are the two major focal adhesion components that binds with CRK to form multiprotein signaling complexes and regulate cell migration (Klemke et al. 1998, Valles et al. 2004, Lamorte et al. 2003).