<prompt> FK 506 is a type of :Immunoglobulin antibodyNon-depolarizing muscle relaxantMacrolide antibioticOpioid anaesthetic  <response>: Tacrolimus is also known as FK-506. It is an immunosuppressant macrolide antibiotic produced by Streptomyces tsukubaensis.Muromonab CD3 is also known as OKT3. It is a monoclonal antibody against CD3 cells. 