in an effort to define the origin of such differentiation boundaries from the time of appearance of the placode , immunocytochemical methods have been used to map the developmental distributions of the cell adhesion molecules , n-cam , l-cam , and ng-cam , and the extracellular matrix molecules , cytotactin and fibronectin , in the cochlea of the chicken embryo .
C0015350
extracellular matrix
C0076088
cytotactin