perforin

 [pur-fer-in]

per·fo·rin

  [pur-fer-in]
noun Biochemistry.
a protein produced by killer cells of the immune system that causes disintegration of targeted cells by forming pores in their membranes.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Perforin is always a great word to know.
So is potassium. Does it mean:
Symbol: K; atomic weight: 39.102; atomic number: 19
Symbol: Cl; atomic weight: 35.453; atomic number: 17
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