Biological Activity
Human AB serum is typically obtained by allowing whole blood to clot naturally, which is known as Off-The-Clot (OTC) serum. Human serum obtained from clotted whole blood is preferred as it usually contains higher levels and a more diverse range of growth factors for optimal cell growth. Human serum from blood-type AB donors lacks antibodies specific for both A and B blood-type antigens. This makes it a universal donor serum th at is suitable for various cell culture types including human stem cell lines.
