Sentences with phrase «type photopigment»
About 8 percent of men, but fewer than 1 percent of women, have impoverished color vision, typically because they lack the gene for either the L - or the M - type photopigment.
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A few years ago scientists at the Johns Hopkins School of Medicine inserted the gene for the human L - type photopigment into mice.
To find out, the biologists developed a way to incorporate the gene for the human L - type photopigment into a small virus known as adeno - associated virus.
Twenty weeks later up to one third of the M - type cones in the animals» retinas had begun to express the L - type photopigment.
Among these primates, most females are trichromats, but the males are dichromats, possessing only the S - and M - type photopigments.