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Fig. 3. Immunohistochemical localization of lamprey parapinopsin and lamprey
rhodopsin in the pineal organ by confocal imaging. (A) Lamprey parapinopsin
immunoreactivity (green) is localized in the dorsal and peripheral regions.
(B) Lamprey rhodopsin immunoreactivity (magenta) is localized in the ventral
and peripheral regions. (C) In the peripheral region, the photoreceptor cells
contain either lamprey parapinopsin or lamprey rhodopsin (arrowheads). (D)
Panel C at higher magnification. l, lumen; p, pineal organ; pp, parapineal
organ. Scale bars, 100 µm.