we conclude that specification of positional information involves stable changes in the phenotypic properties of the differentiating retinal cells that ( i ) render the cells refractory to information about changes in their positions after stage 32 and ( ii ) commit each ganglion cell to the development of a unique property ( locus specificity ) that predisposes its axon to synapse at a particular locus in the retinotectal map .
C0007634
cells
C1708726
locus