Cells in humans and all vertebrates are tightly packed together to form organs and glands — tissues essential for living, breathing and moving. The narrow spaces between cells represent natural weak ...

Cells in humans and all vertebrates are tightly packed together to form organs and glands — tissues essential for living, breathing and moving. “In humans, three families of membrane proteins in ...

Our bodies and organs are shielded from the external environment by tissue barriers like the skin. These barriers must be tightly sealed to prevent unwanted substances from entering. This sealing is ...