What is pertaining to between cells?

"Pertaining to between cells" typically refers to the extracellular matrix (ECM), which is a network of proteins and carbohydrates found outside of cells. The ECM provides structural and biochemical support to surrounding cells, facilitating communication and influencing cell behavior. It plays a crucial role in tissue development, repair, and overall homeostasis. Additionally, intercellular spaces may contain fluids and signaling molecules that further mediate interactions between cells.