The Activin A Receptor Type IB Rabbit mAb Antibody from Signalway Antibody LLC Monoclonal antibody to ACVR1B. This antibody recognizes Homo Sapiens, Human, Mouse, and Rat antigen. The Activin A Receptor Type IB Rabbit mAb Antibody has been shown to work in the following applications: Immunohistochemistry, and Western Blot.