The fluorescence of housefly photoreceptors was studied in viuo by using the deep pseudopupil technique. Whereas the rhodopsin R490 of the peripheral retinular cells fluoresces negligibly the metarhodopsin M580 fluoresces distinctly in the red. The newly discovered metarhodopsin M’ is produced by intense blue light and can be reconverted into rhodopsin by intense long wavelength light. M’ also ...
