The ERα Phospho-Regulation antibody sampler kit can be used to detect phosphorylation of Tyr-537 relative to total ERα expression levels. The kit includes mouse monoclonal and rabbit polyclonal antibodies to detect phospho-Tyr-537, as well as a rabbit polyclonal antibody to detect ERα. The kit also includes anti-Rabbit Light Chain specific:HRP and anti-Mouse Ig specific:HRP secondary reagents for detection of antibodies in Western blot, ELISA, or immunocytochemistry.