opsins and cryptochromes) have been discovered in metazoans. The question arises as to
whether unknown types of photoreceptors exist in the animal kingdom. LITE-1, a seven-
transmembrane gustatory receptor (GR) homolog, mediates UV-light-induced avoidance
behavior in C. elegans. However, it is not known whether LITE-1 functions as a
chemoreceptor or photoreceptor. Here, we show that LITE-1 directly absorbs both UVA and …