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Journal of Neuroscience, Vol 7, 1558-1566, Copyright © 1987 by Society for Neuroscience
A second opsin gene expressed in the ultraviolet-sensitive R7 photoreceptor cells of Drosophila melanogaster
C Montell, K Jones, C Zuker and G Rubin
We have identified a second Drosophila opsin gene, Rh4, which is expressed
specifically in the ultraviolet-sensitive R7 photoreceptor cells. The two
R7 opsins, Rh3 and Rh4, are expressed in nonoverlapping subsets of R7
cells. The Rh4 opsin shares 72% amino acid identity with Rh3, but is only
about 35% homologous with the other 2 Drosophila opsins, ninaE and Rh2.
Twenty-eight amino acids are conserved among all 4 invertebrate and 5
vertebrate opsin genes thus far sequenced, suggesting that these residues
play an important role in rhodopsin function.
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