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Antibody-conjugated quantum dots (QDs) have been used to map the expression dynamics of the cytokine receptor interleukin-2 receptor-alpha (IL-2Ralpha) following Jurkat T cell activation. Maximal receptor expression was observed 48 h after activation, followed by a sharp decrease consistent with IL-2R internalization subsequent to IL-2 engagement. Verification of T cell activation and specificity of QD labeling were demonstrated using fluorescence microscopy, ELISA, and FACS analyses. These antibody conjugates provide a versatile means to rapidly determine cell state and interrogate membrane associated proteins involved in cell signaling pathways. Ultimately, incorporation with a microfluidic platform capable of simultaneously monitoring several cell signaling pathways will aid in toxin detection and discrimination.