, Volume 163, Issue 4, pp 421-423

Evidence for a sensitizing pigment in the ocellar photoreceptors of the fly (Musca, Calliphora)

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A method is described that allows the spectral sensitivity of photoreceptors to be measured with high spectral resolution. It is shown that the sensitivity of the ocelli ofMusca andCalliphora has a vibrational fine structure in the ultraviolet, strongly indicative of a sensitizing pigment. The visual pigment has its absorption maximum close to 425 nm.