Santa Cruz Biotechnology offers an expansive library of transfected lysates that overexpress steroid receptors. Steroid receptors play diverse and important roles within individual organisms. As an example, androgens exhibit a wide range of effects on the development, maintenance and regulation of male phenotype and reproductive physiology in males. Other steroid receptors include estrogen receptors (ER), peroxisome proliferator-activated receptors (PPARs), progesterone receptor (PR), and Nur77. Transfected lysates that express steroid receptors offer a reliable means to evaluate antibody quality and serve as excellent positive controls for experiments involving antibodies.