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Zeta-Chain Associated Protein Kinase 70 kDa (ZAP-70), a member of Syk family (non-receptor protein tyrosine kinase family), has an imperative function in the immune cell signaling in T cells. Its role in T-cell development has been established by the severe combined immune deficiency syndrome in ZAP-70 deficient humans. Moreover, defects in T-cell activation and downstream signaling events were observed in T-cells that lack ZAP-70. Thus, the crucial role of ZAP-70 in the development and activation of T-cell and its predominant expression in T-cells make it a logical target for the treatment of pathological conditions related to abnormal T-cell responses. The present review article portrays the domain structure of ZAP-70 along with its implication in T-cell signaling. Additionally, varied ZAP-70 inhibitors published in different patents and papers have also been reviewed. [ABSTRACT FROM AUTHOR]