# CD21

> English word · Noun

## Definitions
1. B-cell and FDC membrane protein involved in the complement system and B cell coreceptor complex, and bound by EBV.

## Etymology
from cluster of differentiation

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/cd21