LEP and infection: The yellow or white fluorescence intensity (FI) reflecting the Lep-vesicle-early endosomes or Lep-vesicle-recycling endosomes in the infected HUVEC, EOMA, BJ, HK-2 or TCMK-1 cells showed a slight decrease during the late stages of infection, while the FI in the infected mouse fibroblasts (NIH/3T3) continued to increase (Figure 3C and F).