Proliferative neural cells express delta genes. Labeling to detect incorporation of BrdU during S phase of the cell cycle (brown staining) and RNA expression (blue staining). Images are of transverse sections through trunk neural tube. BrdU-labeled cells expressed dlA (A), dlD (B) and dlB (C). Scale bar, 10 μm.
Appel et al. BMC Developmental Biology 2001 1:13 doi:10.1186/1471-213X-1-13