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Expression levels of 20 opsin genes in adult and larval visual organs of S. frequens and O. albistylum. (A–D) Nonvisual opsin genes. (E) Visual opsin gene of UV type. (F–J) Visual opsin genes of SW type. (K–T) Visual opsin genes of LW type. D, dorsal region of adult eyes; L, larval whole head; O, adult head region containing ocelli; O.a., O. albistylum; S.f., S. frequens; V, ventral region of adult eyes. The numbers indicate FPKM values.
