| subunit | <cell biology> Components from which a structure is built, thus myosin has six subunits, microtubules are built of tubulin subunits. In some cases it may be more informative to speak of protomers. (06 Mar 1998) |
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| subunit vaccine | <pharmacology> A vaccine composed of a purified antigenic determinant that is separated from the disease-causing organism. (06 Mar 1998) |