Spatial order within but not between types of retinal neurons

We studied the mosaics of six types of retinal neurons, asking how the posi tion of a cell relates to the positions of other cells of that same type an d also to cells of different types. Every neuron studied was found to be no nrandomly positioned: Cells of a particular type were evenly spaced. Howeve r, all cells were positioned randomly with respect to members of the other cell classes. This was true even when the cells were known to be synaptical ly connected. It is consistent with a concept of developmental pattern form ation in which (i) the number of cells of a particular type and their lamin ar distribution are specified, and (ii) the final spatial position of each cell is controlled exclusively by a rule that prevents cells of the same ty pe from being positioned close to each other. This sequence would imply tha t a cell's final position is independent of the cell's position at the time of its specification, and we suggest a reason why, in laminar structures c ontaining many cell types, it might be desirable for this to be so.