A New Strain of Immunodeficient Mice Has Been Discovered, and Found

A new strain of immunodeficient mice has been discovered, and found to have T cells that are unresponsive to TCR stimulation. The T cells from these mice have normal levels of the TCR complex on their surface, but when this TCR is stimulated, the cells fail to secrete IL-2. As a first step in determining the signaling defect responsible for this immunodeficiency, the T cells are stimulated with a phorbol ester (PMA) and Ionomycin. It is found that this treatment elicits IL-2 production by the immunodeficient T cells. Based on this information, candidate genes that could be mutated in these T cells include all of the following EXCEPT:

A) ZAP-70
B) PLC- $\gamma$
C) SLP-76
D) ITK
E) Calcineurin