Ommatidium - an overview | ScienceDirect Topics
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WEB2.2.4.4 Ommatidial subtype specification: Hth, IroC, Otd, Ss, Melt, and Wts. Four distinct subtypes of ommatidia, called pale (p), yellow (y), dorsal yellow (dy), and dorsal rim area (DRA) ommatidia, are present in the adult eye and are defined based on which rhodopsins are expressed the R7 and R8 cells ( Fig. 5.6 B ).
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