Figure 7
Melanocyte photoreceptive system: a. Dermatomic map outlining the placodal photoreceptive system shown as shaded areas. b. 40 h neural tube of chick embryo identifies areas of high inductive activity. c. Photoreceptors: i. Melanin Units: Non dendritic melanocytes on dark incubation and dendriticity on UV exposure. ii. Panel depicts melanin units on light and EM in controls and on UV exposure with dendrites extending towards the source of UV. iii. Hair follicle: Dark incubation shows non dendritic melanocytes in the hair bulb. UV exposure: Melanocytes show dendrites directed towards the shaft on UV exposure.