Fig. 6From: Tooth and scale morphogenesis in shark: an alternative process to the mammalian enamel knot systemCell proliferation pattern during tooth bud (a–d) and scale bud (e–h) development in the catshark Scyliorhinus canicula. a–d Histological sections of dissected jaws. e–h Histological sections of dissected tails. PCNA staining appears red and counter-staining of the nuclei is blue. Developmental stages are indicated on the figure. Scale bars: 50 μmBack to article page