Retraction WE WISH TO RETRACT OUR REPORT "REQUIREment of voltage-gated calcium channel β 4 subunit for T lymphocyte functions" (1). The conclusions of our paper were based in part on electrophysiological data. We now believe that the data in Fig. 4B (prepared by S.B.) are erroneous, and that the conclusions of the electrophysiological results cannot be relied upon. In the interests of scientific integrity and the scientific literature, we believe the appropriate response is to retract this paper in its entirety.