during which phase does the cleavage furrow start forming
Many reports implicate Rho in cytokinesis. Rho has been found to localized to the cleavage furrow (Takaishi et al, 1995) regulating cortical activity during cytokinesis (O'Connel et al, 1999) and has a role in the organisation of the contractile ring in sand dollar eggs (Mabuchi et al, 1993).