Navalta, J., McFarlin, B., Simpson, R., Fedor, E., Kell, H., Lyons, S., Arnett, S., Schafer, M. Finger-stick Blood Sampling Methodology for the Determination of Exercise-induced Lymphocyte Apoptosis. J. Vis. Exp. (48), e2595, doi:10.3791/2595 (2011).