Aquaporins: The One-Molecule-at-a-Time Moisturizer

Perspiration dripping off a sweating brow can be easily seen, one drop at a time. Moisture within a biological cell is similar, although it happens on a smaller scale-one molecule at a time, in a channel through the middle of a protein embedded in the membrane surrounding the cell. That protein is called an aquaporin because it is a pore through which water passes in and out.

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