Receptor mRNAs identified by microarray for motor neurons (MNs; column 1) and by RNA-seq for RGCs (column 3), as defined using the updated ligand-receptor database (modified from Yuzwa et al., 2016). Only included are receptor mRNAs that had expression levels exceeding a cutoff of the top 87% of mRNAs for motor neurons and FPKM of 1 for RGCs. Also shown are receptor mRNAs that overlap between sensory, sympathetic and motor neurons (column 2) or between all four populations of neurons (column 4). The sensory and sympathetic neuron receptor mRNAs are shown in Table 8. The total numbers of receptor mRNAs in each column are indicated.