a combination of extracellular molecules on other cell surfaces. Gap junctions (yellow) are clusters of channels that form tunnels of aqueous connectivity between cells.

Tight junctions form a seal between cells that is so strong that not even ions can pass across it. Gap junctions are involved in cellular communication — not just in epithelial tissue ...

Even with some other semiconductor material with a higher band gap, peak efficiency could only go as high as 33.7%. A multi-junction solar cell developed by NREL. It glows red due to gallium ...