May act as a lysosomal receptor (By similarity). May be involved in macropinocytosis and fluid phase exocytosis. Binds to the anionic phospholipid phosphoinositol 4,5-bisphosphate, but not to phosphatidylcholine and only weakly to phosphatidylserine. Localizes to membranes of endolysosomal vesicles and macropinosomes. Found at all stages of development. Down-regulated at the onset of aggregation, but small amounts are still detectable at late stages of development (at protein level). Heavily glycosylated. Belongs to the CD36 family.