Plural of apyrase, an enzyme that breaks down ATP and ADP molecules in cells, often found in saliva and other bodily fluids.
From Greek 'a-' (without) + 'pyr' (fire) + '-ase' (enzyme suffix). The enzyme was named for its ability to remove phosphate groups without generating heat, contrasting with pyrogenic reactions.
Apyrases are nature's cleanup crew for a molecular currency—ATP is like energy money in your cells, and apyrase is the banker removing old bills. Bloodhound saliva contains apyrase, which is why their bites don't cause as much clotting damage as other predators!
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