Adapter protein which interacts with C-terminal portion of mbc, homolog of human DOCK180. May play a role in cellular processes throughout development. Embryonic zygotic expression is seen in invaginating presumptive mesoderm and ectodermally derived tissues during gastrulation. At stage 8, expression is also seen in anterior and posterior midgut and cephalic furrow. By stage 9, expression is highest in visceral mesoderm of anterior and posterior midgut, ventral nerve cord and somatic mesoderm. Expressed both maternally and zygotically throughout embryogenesis, declines during larval stages and reappears during pupation. Belongs to the CRK family.