Fig. 2.

(a) Fluorescence imaging of APN-CyI (2 μM) in HepG-2 cells and LO2 cells. The inhibition groups were pre-incubated with 50 μM bestatin. (b) Average fluorescence intensity of APN-CyI in various treated cells. (c) The co-incubation assays of HepG-2 cells (yellow region) and COS-7 cells (green region) with APN-CyI or CyI-OH. (d) Average fluorescence intensity of APN-CyI or CyI-OH in various cells. λ_ex = 640 nm, λ_em = 700–800 nm. Scale bar = 20 μm. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)