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| Gene Name | Description |
|---|---|
| FRE1 | Ferric reductase and cupric reductase; reduces siderophore-bound iron and oxidized copper prior to uptake by transporters; expression induced by low copper and iron levels |
| FRE2 | Ferric reductase and cupric reductase; reduces siderophore-bound iron and oxidized copper prior to uptake by transporters; expression induced by low iron levels but not by low copper levels |
| FRE3 | Ferric reductase; reduces siderophore-bound iron prior to uptake by transporters; expression induced by low iron levels |
| FRE4 | Ferric reductase; reduces a specific subset of siderophore-bound iron prior to uptake by transporters; expression induced by low iron levels |
| FRE5 | Putative ferric reductase with similarity to Fre2p; expression induced by low iron levels; the authentic, non-tagged protein is detected in highly purified mitochondria in high-throughput studies |
| FRE6 | Putative ferric reductase with similarity to Fre2p; expression induced by low iron levels; targeted to vacuole via AP-3 pathway |
| FRE7 | Putative ferric reductase with similarity to Fre2p; expression induced by low copper levels |