Plural form of alexine; multiple types or instances of immune-protective substances in blood.
Plural of alexine, formed by adding -s. Used in early immunology literature when scientists discussed various protective factors in serum.
When early immunologists talked about 'alexines' in the plural, they were describing mysterious factors they couldn't yet isolate or name individually—it was like knowing you had an army but not yet being able to count the soldiers.
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