Figure 6: Expression of Pax3 and Magic-F1 at 17.5 dpc. Specific Pax3 transcripts are localized on sagittal sections of 17.5 dpc at the level of the head (a), in the nucleus pulposus (b) of lumbar intervertebral disc (arrows) of the trunk, and in cartilage primordium (arrowheads) and wall of spinal cord in midlumbar region (double arrow) as shown in (b) and in cartilage primordium of dorsal part of ribs (c). (d) Magic-F1 signal was observed at the level of cartilage primordium (arrows) of vertebrae.