CD63 and neoplasm: Using immunofluorescence analysis, the dynamics of EGF-QD co-localization with antibodies against markers of early endosomes (Rab5, EEA1), multivesicular/late endosomes (Rab7, CD63), and lysosomes (Lamp1) were investigated in two typical tumor cell lines (HeLa, A549) and three enMSC lines (enMSC2804, ECL2455, enMSC2503).