Fab region

noun

The portion of an antibody formed from the variable region domains and the first constant region domains of the heavy and light chains, constituting one of the two arms and containing the antigen‑binding site.

Similar
fragment antigen‑binding region
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Meanings

nounFab region (plural Fab regions)

plural Fab regions

  1. molecular biologybiochemistryThe portion of an antibody formed from the variable region domains and the first constant region domains of the heavy and light chains, constituting one of the two arms and containing the antigen‑binding site.

    Synonyms: fragment antigen‑binding region

Synonyms & antonyms

nounThe portion of an antibody formed from the variable region domains and the first constant region domains of the heavy and light chains, constituting one of the two arms and containing the antigen‑binding site.

Similar
fragment antigen‑binding region
Cite this entry
APA

Fab region. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/Fab%20region

MLA

“Fab region.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Fab%20region. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “Fab region,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/Fab%20region.

Source: Fab region on Wiktionary, CC BY-SA 4.0.