Communication between cells.
D000818:Animals; D002450:Cell Communication; D002462:Cell Membrane / Q000502:physiology / Q000648:ultrastructure; D007365:Intercellular Junctions / Q000502:physiology* / Q000648:ultrastructure; D008565:Membrane Proteins / Q000502:physiology; D009712:Nucleotides, Cyclic / Q000502:physiology
D008565:Membrane Proteins; D009712:Nucleotides, Cyclic