Phagocytic cells do not have an FC receptor for IgM, making IgM ineffective in assisting phagocytosis; however, IgM is extremely efficient at activating complement and is therefore considered an opsonin.
Phagocytic cells do not have an FC receptor for IgM. An FC receptor for IgM is making IgM ineffective in assisting phagocytosis. IgM is extremely efficient at activating complement. This is however. IgM is therefore considered an opsonin. This was however.