The Journal of Comparative Neurology SINGLE CELL TRANSCRIPTIONAL PROFILE OF MGCS 231 Fig. 3. Cluster analysis of retinal single cells. A hierarchical cluster analysis was run on the Affymetrix signals from 19 devel- oping amacrine (ACs) and ganglion cells (RGCs), 2 immature rod photoreceptors (PRs) from postnatal day 0 (P0), 2 mature rod photoreceptors, and 5 mature M u¨ller glial cells (MGs). Selected portions of clusters are shown as a heatmap. Columns represent the samples, and rows represent the transcripts (with abbreviated name and Affymetrix ID). A: Part of the cluster around the gene Aqp4, revealing genes enriched in M u¨ller glia. B: A cluster of photoreceptor speciﬁc genes.