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. 2021 Sep 16;26(18):5629. doi: 10.3390/molecules26185629

Figure 4.

Figure 4

Principle of determining the substrate of a drug at toxic concentrations (e.g., [8,96,97,101,102]) by assessing the ability of cells lacking a particular transporter gene to survive its presence, while the wild-type cells, or cells knocked out for other genes not involved in the drug’s transport, are killed. Obviously, this is the extreme; there may also be degrees of resistance.