 SLAMF1 and SLAMF6 are known to directly interact with outer membrane porins on gram negative bacteria.SLAMF1 is a known receptor for the measles virus and also serves as an opsonin for phagocytic cells, enhancing phagocytosis by localizing to phagosomes and inducing a signaling cascade resulting in enhanced fusion of phagosomes and lysosomes.SLAMF2 is known bind gram negative bacteria and is internalized after binding, promoting phagocytosis.