Fig. 3. Quantification of differential loss of molecularly defined spinal interneuron populations in Pcdh- null mutant mice. Bars (in this and all subsequent bar charts) show mean ±s.e.m. of cell counts from 18 sections per molecular marker, taken from three animals per genotype. The survival of each cell population in E17 Pcdh-^del/del spinal cords is expressed as a percentage of that in controls.