1 NPY-IR amacrine cells predominantly received synaptic input from bipolar cell axon terminals (86%), while a few input from other amacrine cell processes (14%).

2 As for ultrastructure, quantitative analysis showed that NPY-IR amacrine cell processes were most often presynaptic to NPY negative amacrine cell processes (49.7%) and ganglion cell dendrites (49.3%).

3 Results show that GABA-IR structure of both groups was observed in amacrine cells, inner plexiform layer, ganglion cells and nerve filament layer.

4 In the retina of RCS rats, GABA-like immunoreactivity was observed in the inner plexiform layer, few GABA-ergic amacrine cells and the ganglion cell layer.

5 Results: GABA-IR structure of both groups was observed in amacrine cells, inner plexiform layer, ganglion cells and nerve filament layer.

6 The results showed that after postnatal day 3, the density of cholinergic amacrine cells decrease as the retina expand, consistent with the predictions made from diameter of growing eye balls.