Which of the following is NOT a type of cell junction?

The correct choice identifies Receptor Mediated Junctions as not being a type of cell junction. In tissue engineering and cellular biology, cell junctions are specialized structures that connect cells to each other and to the extracellular matrix, playing essential roles in maintaining tissue architecture and regulating communication between cells.

Tight junctions are crucial for regulating the passage of substances between cells and thereby contribute to maintaining the integrity of tissue barriers. Anchoring junctions, also known as adhesive junctions, provide mechanical strength by connecting the cytoskeleton of a cell to neighboring cells or to the extracellular matrix. Communicating cell junctions, such as gap junctions, facilitate intercellular communication by allowing the direct transfer of ions and small molecules between adjacent cells.

Receptor mediated processes do exist, but they do not constitute a type of junction. Instead, they usually refer to signaling mechanisms where specific receptors on a cell's surface bind to ligands, leading to various cellular responses. Thus, in the context of types of cell junctions, Receptor Mediated Junctions would not be categorized alongside the well-established junctions like tight, anchoring, and communicating junctions.