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Fig. 1. (A) Schematic representation of the eyestalk of P. clarkii. R, retina; ME, medulla externa; MI, medulla interna; MT, medulla terminalis; HB, hemiellipsoid body; LG, lamina ganglionaris. The dark region represents cells expressing CRY immunoreactivity in MT-HB. Note the cluster of cells located in the inferior region of the hemiellipsoid body. (B) Schematic representation of the brain of P. clarkii. PR, protocerebrum; PT, protocerebral tract; AMC, protocerebral anterior median cluster; DC, deuterocerebrum; TC, tritocerebrum. Note the dark region representing the protocerebral median cluster immunoreactivity.