Pel-Freez Biologicals has long been recognized by the World Health Organization as a supplier of 3-4 week rabbit complement for the SBA and MOPA functional antibody assays used in vaccine evaluation by some of the largest vaccine manufacturers in the world. It is also used upstream at the research and development level for cytotoxicity and cell depletion assays. Adult rabbit complement is a primary reagent used in tissue typing for organ transplantation and lymphocytoxicity testing. Pel-Freez features large lots, consistent processing and extensive QC for reliable results. Ancillary products are offered for ease of one-stop ordering and shipping.