Comparison of midline neurons and glia present within CNS segments of wild type, N55e11 and mamΔC mutant embryos during late embryogenesis.

aMidline precursors MP1, 3 and 4 are present during embryonic stage 10 give rise to thebmidline neural and glial subtypes listed in the second column [43].cThe various midline lineages were identified using the markers listed.dAll of the midline lineages that normally express sim in wild type embryos were absent in N55e11 mutants, whereas all of the midline lineages that do not express sim in wild type embryos were present in N55e11 mutants [29].eThe number of each cell type found in a single CNS segment of wild type, N55e11 and mamΔC mutant embryos at stage 16 is shown. The results obtained with N55e11 mutant embryos were similar to those reported for Dl3 mutants in a previous study [6].