“…A number of investigators have also studied the enzyme distribution within the retina during its development (5,30,31). These studies have revealed that AChE activity localizes in ganglion and amacrine cells, and in the inner plexiform layer of almost all species so far examined (5,10,12,19,20,25,28). In addition, the presence of enzyme activity has been reported within the horizontal cells of the rat (31), rabbit (28), chick (30) and fish (10), and within the outer plexiform layer of the frog (5), newt (8) and fish (10).…”