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Cellular marker compounds used as the MSI quality indicators.
| Ionization | Cellular Marker Compound | Adduct Ion | Monoisotopic m/z (Da) |
|---|---|---|---|
| Negative | ATP | [M − H]− | 505.988 |
| Heme (Fe II) | [M − H]− | 615.170 | |
| Positive | IMP | [M + Na]+ | 371.037 |
| Heme (Fe III) | [M]+ | 616.177 |
