Fig. 4.

UV-sensitive proteins are located within the tadpole caudal diencephalon. (A) Schematic of a Xenopus tadpole brain showing the approximate position of sections taken for imaging. (B) OPN5-positive neurons within the caudal diencephalon of a stage 55 tadpole. (B, ii) A cluster of neurons is located in the ventral half of the diencephalon in proximity to the hypothalamic ventricle (hv); expanded view of the boxed area (B, iii) and a second more ventral image from a different preparation (B, iv). Examples of neuron cell bodies at arrows in B, iii and B, iv. (Scale bars, 100 μm.)