The control group MSCs obtained on days 1, 3, 5, 7, and 9 after CAFs were induced by gastric cancer (GC803 and AGS) exosomes were fixed and labeled with rhodamine (red) for P65, Alexa Fluor 488 (green) for PKM2, and Hoechst 33342 (blue) for the nucleus. Here, PKM is linked to gastric cancer.