The Alpha SureFire® Ultra™ Multiplex p-EGFR (Tyr1068) + Total EGFR assay kit is used to measure both phosphorylated and total levels of EGFR in cellular lysates. The assay is an ideal system for the screening of modulators of receptor activation (e.g. agonists and antagonists) as well as agents acting intracellularly, such as small molecule inhibitors of signal transduction. The assay will measure EGFR (Tyr1068) activation by either recombinant or endogenous receptors, and can be applied to primary cells.