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(A) ‘Outer’ photoreceptors (grey, only R1 and R6 are shown) express Rh1 and surround the ‘inner’ R7/8, which occur in four subtypes (B) that express different rhodopsins: pale (Rh3/Rh5), yellow (Rh4/Rh6), dorsal yellow (Rh3+Rh4/Rh6) and dorsal rim (Rh3/Rh3). Note that dorsal rim R7/8 are monochromatic and have enlarged rhabdomeres.
