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. 2021 Jul 15;19:211. doi: 10.1186/s12951-021-00902-8

Fig. 3.

Fig. 3

Schematic illustrations of TME targeting. The TME is characterized by hypoxia, slight acidity, a high GSH level and so on. Taking advantage of these characteristics, GBNs can be modified to target the TME for better function. Abbreviations: TME, tumor microenvironment; GSH, glutathione; HIF, hypoxia-inducible factor; -S–S-, disulfide bond; CA IX, carbonic anhydrase; M75, a monoclonal antibody