Figure 3. Biological application of TPEARG in living cells. (A) 1 μM TPEARG was added in the RAW264.7 cells, M1 macrophages, M2 macrophages, and M2 macrophages pretreated with BEC (An arginase inhibitor), and imaged under the excitation of 400 nm. (B) Fluorescence intensity output of each group in Figure 3A. (C) Dynamic imaging detection of arginase using TPEARG in M2 macrophages pretreated with BEC for incremental time. (C) Fluorescence intensity output of Figure 3C. The data are expressed as mean ± SD.