Plural of alexin; multiple immune-protective substances found in blood serum.
Standard English plural of alexin, formed by adding -s. Used in immunological and medical literature from the late 19th and early 20th centuries.
The study of alexins eventually led to the discovery of 'complement'—a cascade of proteins that modern medicine now understands is one of the immune system's most elegant mechanisms, like a biochemical domino chain of defense.
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