What type of cell junction primarily allows for communication between adjacent cells?

Gap junctions are specialized structures that facilitate direct communication between adjacent cells. They are composed of protein channels known as connexons, which bridge the gap between the membranes of two neighboring cells. This allows for the passage of small molecules, ions, and electrical signals, enabling rapid intercellular communication.

In contrast, tight junctions serve to block passage between cells, creating a barrier that maintains the distinct environments of adjacent cells. Desmosomes provide structural support to tissues by anchoring adjacent cells together, particularly in areas subjected to mechanical stress, but they do not facilitate communication. Adherens junctions also contribute to cell adhesion and the maintenance of tissue integrity, yet their primary function is not communication but rather providing connection to the cytoskeleton for added strength.

Therefore, gap junctions are uniquely suited to the role of communication between adjacent cells in a variety of tissues, making them the correct choice in this context.