Figure 2.

Sagittal section of a stage 21 chick embryo which received a PB-coated bead (B) at stage 17. Tissue is processed for immunocytochemistry using the axonal marker, MAP Ib. Immunoreactive axonal processes (arrows) extend out of the epithelium and course through the bead (arrows) towards the telencephalic vesicle (TEL). Scale bar= 10 μm.