Potential role of intratumor bacteria in mediating tumor resistance to the chemotherapeutic drug gemcitabine Fluorescence in situ hybridization was used to detect bacterial 16S rRNA sequences in a human PDAC tumor (red). Cell nuclei were stained with 4,6- diamidino-2-phenylindole(DAPI) (blue). Four sections from one tumor are presented. Scale bars,10 mm. 感染猪鼻支原体 4Fluorescence in situ hybridization was used to detect bacterial 16S rRNA sequences in a human PDAC tumor (red). Cell nuclei were stained with 4′,6- diamidino-2-phenylindole (DAPI) (blue). Four sections from one tumor are presented. Scale bars, 10 mm. 4 Potential role of intratumor bacteria in mediating tumor resistance to the chemotherapeutic drug gemcitabine 感染猪鼻支原体