A protein tyrosine kinase that is required for T-CELL development and T-CELL ANTIGEN RECEPTOR function.

Synonyms: Protein-Tyrosine Kinase, ZAP-70, Syk Related Tyrosine Kinase, ZAP-70 Protein, EC 2.7.10.2, ZAP-70 Protein-Tyrosine Kinase, ZAP 70 Kinase, 70 kDa Zeta-Associated Protein, Syk-Related Tyrosine Kinase, ZAP 70 Protein Tyrosine Kinase, Kinase, ZAP-70, ZAP-70 Kinase, zeta-Chain Associated Protein Kinase (ZAP-70), ZAP 70 Protein, 70 kDa Zeta Associated Protein, Tyrosine Kinase, Syk-Related