Fig. 10. Retinal mosaic of blue- and UV-sensitive photoreceptors. (A) Diagram of the Manduca retina drawn to scale, showing locations of the retinal patches illustrated in B-E. Anterior is to the right. The equatorial division (eq) between dorsal and ventral retinal domains is indicated, as is the dorsal rim area (dr). Scale bar, 0.5 mm. (B,C,E) Diagrammatic representations of retinal patches mapped from adjacent sections stained for P450 and P357, respectively. Each hexagon represents a retinula containing potentially two dv cells. A uniformly colored hexagon represents a retinula containing two identical cells. A hexagon divided in half horizontally is a retinula with unlike or missing cells. Blue represents cells expressing P450; red represents cells expressing P357; white indicates no staining by either antiserum in that position. (B) Domain in the dorsal retina that extends into dorsal rim region (dr), whose margin is represented by the heavy line. Some dorsal-ventral rows of retinulae terminate before reaching the edge of the retina. Red lines in the dorsal rim region represent the narrow dv cells that express P357. (C) Domain in the ventral retina. (D) Large patch at the center of the retina for which grayscale micrographs of adjacent sections immunostained for P450 and P357 have been superimposed and arbitrarily colored (blue, anti-P450; red, anti-P357) in Adobe Photoshop. Scale bar, 100 µm. (E) Equatorial sector from the adjacent sections shown in D.

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