Figure 1. Expression levels of neurotransmitter receptors differ in early and late retinal progenitors, as well as in Müller glia. Varying expression levels of N-methyl-D-aspartate (NMDA) receptors, muscarinic receptors and nicotinic acetylcholine receptors (AChR) are depicted throughout development in early and late retinal progenitors and mature retinal ganglion cells (RGCs), as well as in Müller glia.