taken together with other direct and indirect estimates of endocytic vesicle ph , these studies indicate that endocytic vesicles in many cell types rapidly acidify below ph 5.5 , a ph sufficiently acidic to allow receptor-ligand dissociation and the penetration of some toxin chains and enveloped virus nucleocapsids into the cytoplasm .
C0887883
endocytic vesicles
C0010834
cytoplasm