Leading Biology's Phospho-MEK1-pS221 Rabbit pAb (AMR00816N) is a Rabbit Polyclonal antibody. This antibody has been shown to work in applications such as: Western Blot. The Phospho-MEK1-pS221 Rabbit pAb (AMR00816N) Antibody was generated using Map2k1 as the antigen and it reacts with Human, Mouse, and Rat.