# CD19

> English word · Noun

## Definitions
1. protein found on the surface of most B-cells, associating with the B-cell receptor complex

## Etymology
from Cluster of Differentiation number 19

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/cd19