a key step in the process is the rapid acidification of endocytic vesicles to a ph of 5.0-5.5 this acidification allows dissociation of several ligands from their receptors , the release of iron from transferrin , and the penetration of diphtheria toxin and some viral nucleocapsids into the cytoplasm .
C0887883
endocytic vesicles
C0010834
cytoplasm