Fig. 6From: The structure of blood–tumor barrier and distribution of chemotherapeutic drugs in non-small cell lung cancer brain metastasesThe immunofluorescence (IF) of brain tissues at different time points after implantation of cells. The nuclei were stained by Hoechst. GFAP and CD31 were specific markers of astrocytes and endothelial cells, respectively. The lower left rectangular boxes in figure Merge were the enlarged portion of the yellow frame in the figuresBack to article page