Word: extracellular
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Dates: during 1990-1999
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...theory has been that the virus binds to several extracellular proteins--"gates" through which the disease must pass before entering the cells...
Stickiness is central to almost all biological processes. Cells are able to form organs and function as a unit thanks to a fascinating category of complex glues they secrete known as extracellular matrix. Securing cells in their matrix are Velcro-like patches called cellular-adhesion molecules (CAMs), which are present on every cell except red blood cells. These cellular glues not only hold things together but also play a vital role in growth, fetal development, repair of damaged tissue and elimination of noxious invaders...