EOG89627B GO:0007602 1/7 phototransduction biological_process "The sequence of reactions within a cell required to convert absorbed photons into a molecular signal." [GOC:go_curators] EOG89627B GO:0004930 1/7 G-protein coupled receptor activity molecular_function "Combining with an extracellular signal 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, http://www.iuphar-db.org, Wikipedia:GPCR] EOG89627B GO:0007601 1/7 visual perception biological_process "The series of events required for an organism to receive a visual stimulus, convert it to a molecular signal, and recognize and characterize the signal. Visual stimuli are detected in the form of photons and are processed to form an image." [GOC:ai] EOG89627B GO:0016021 1/7 integral component of membrane cellular_component "The component of a membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane." [GOC:dos, GOC:go_curators]