name: G protein-coupled photoreceptor activity
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def: "Combining with incidental electromagnetic radiation, particularly visible light, and transmitting the signal across the membrane by activating an associated G-protein; promotes the exchange of GDP for GTP on the alpha subunit of a heterotrimeric G-protein complex." [GOC:bf, GOC:dph, ISBN:0198506732]
synonym: "G protein coupled photoreceptor activity" EXACT 
synonym: "G-protein coupled photoreceptor activity" EXACT 
synonym: "photoreceptor activity, G-protein coupled" EXACT [GOC:bf]
is_a: GO:0004930 ! G protein-coupled receptor activity
is_a: GO:0009881 ! photoreceptor activity
relationship: part_of: GO:0009584 ! detection of visible light
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