More information: Masatake Kai et al, Suppression of Pcdh8/paraxial protocadherin is required for efficient neighbor exchange in morphogenetic cell movement during zebrafish notochord formation ...
Repulsive forces-mediated by protocadherins promote cell migration and axon ourgrowth of abducens motor neurons (left) . Loss of the rupulsive forces leads to clumping phenotype (right).