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Finding in flies could help treat human eye disorders

Fruit flies have a pigment in their tiny brains that allows them to tell the difference between night and day, according to new research. Scientists previously understood how six biological pigments called rhodopsins in the eyes of fruit flies allow them to filter light, discern objects and detect temperatures. But the study published in the journal Nature today described how a seventh rhodopsin expressed in the flies' central brains was important in discerning night from day.

Why you should care: The discovery could teach researchers how to deal with degenerative disorders that affect human vision.