The Vav phospho-regulation antibody sampler kit can be used to examine the level of phosphorylation of Vav2 (Tyr-142) and Vav2 (Tyr-172), as well as the conserved sites in Vav1 and Vav2. In addition, antibodies are provided to monitor the total expression level of Vav1, Vav2, and Vav3.