Signalway Antibody LLC's JAK2(Phospho-Tyr221) Antibody is a Rabbit Polyclonal antibody. This antibody has been shown to work in applications such as: Immunohistochemistry. The JAK2(Phospho-Tyr221) Antibody was generated using JAK2, and Janus kinase 2 as the antigen and it reacts with Human, Mouse, and Rat.