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Signals from TCR (T cell receptor) activate which of the following protein?

Signals from TCR (T cell receptor) activate which of the following protein? Correct Answer Protein tyrosine kinase

Protein tyrosine kinase (also denoted as PTK) is one of the most important protein responsible for the activation of T cells. For carrying out the activation of T cells, this protein itself is in the inactive mode initially. In order to activate this protein, it requires the signals from T cell receptor (TCR), CD4 or CD8 T cells. 

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