• WordNet 3.6
    • n protamine a simple protein found in fish sperm; rich in arginine; simpler in composition than globulin or albumin; counteracts the anticoagulant effect of heparin
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Century Dictionary and Cyclopedia
    • n protamine A member of a group which comprises the simplest albumins known to occur in the animal body. According to Kossel, a protamine group also forms the essential nucleus of all the more complex albumins. This view is not generally held, however, and as a matter of fact a protamine radical has thus far been demonstrated in relatively few instances. Without exception the few members of the group have been met with in the mature testicles of certain animals; for example, salmine in the salmon, sturine in the sturgeon, clupein in the herring, etc.
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In news:

All elective open-heart surgeries were cancelled at Vancouver General Hospital and St Paul's Hospital due to dangerously low supplies of protamine, a drug required to reverse the blood-thinning effects of medications used during heart bypass.