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| Gene Locus | Km for Acetaldehyde | Tissue Distribution |
|---|---|---|
| Class I ALDH1 | 30 µM | Liver and many other tissues |
| Class II ALDH2 | <1 µM | Low levels in most tissues with the expression highest in liver compared to kidney and muscle |
| Class III ALDH3 | 11 mM | Stomach, liver, cornea |
