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Gap junctions and plasmodesmata are specialized sites of communication between adjoining cells in animals and plants respectively. Gap Junctions Gap junctions readily allow the passage of small molecules and ions required for rapid communication (such as heart tissue), but do not allow the passage of larger molecules such as proteins Gap Junction
Consequently, the relevance of cell communication is quite vast, but major areas of fundamental research are often divided between the study of signals at the cell membrane and the study of signals within and between intracellular compartments.ultiple cell types can then join together to form tissues such as muscle, blood, and brain tissue. In single-celled organisms, signaling allows populations of cells to coordinate with one another and work like a team to accomplish tasks no single cell could carry out on its own.