Fig. 5.

Section showing the deep zone of a trephine-wounded explant demonstrates incorporation of ³H-thymidine predominately behind the zone of cell death as represented by the dotted line. Image shows remaining viable cells within the zone of cell death either labelled with ³H-thymidine or existing as a doublet. Scale bar, 50 µm; arrows indicate wound edge, and the microautoradiograph was counterstained with haematoxylin and eosin.