EOG869T8C GO:0016021 27/94 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] EOG869T8C GO:0004872 1/94 receptor activity molecular_function "Combining with an extracellular or intracellular messenger to initiate a change in cell activity." [GOC:ceb, ISBN:0198506732]