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In Figure 4 and accompanying text, the actual values for the tissue dosed in vivo should be 25.4 ± 4.9 and 22.9 ± 2.6 μg RIF/g tissue for HPLC-MS/MS and MALDI IMS, respectively. The values are correct in the Supplemental Figure 4 images.
The structure for the RIF fragment at m/z 397 in Supplemental Figure 1 should be as follows.
