# T cell activation

> The change in morphology and behavior of a mature or immature T cell resulting from exposure to a mitogen, cytokine, chemokine, cellular ligand, or an antigen for which it is specific.

**Wikidata**: [Q14863969](https://www.wikidata.org/wiki/Q14863969)  
**Source**: https://4ort.xyz/entity/t-cell-activation


## References

1. Gene Ontology release 2019-10-07
2. UMLS 2023