protomer

protomer
A structural subunit of a larger structure. Protomers may themselves consist of subunits. For example, tubulin, an αβ dimer, is the p. for microtubules. [G. protos, first, + -mer 1]

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pro·to·mer (proґto-mər) [protein + monomer] one of the identical subunits of which an oligomeric protein is composed.

Medical dictionary. 2011.

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