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| PR:000007894 | GTP cyclohydrolase 1 feedback regulatory protein | | |  | | |
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| PR:000039233 | GTP cyclohydrolase 1 feedback regulatory protein isoform 1 | | |  | | |
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| PR:P30047-1 | GTP cyclohydrolase 1 feedback regulatory protein isoform 1 (human) | | |  | | |
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| PR:P99025-1 | GTP cyclohydrolase 1 feedback regulatory protein isoform 1 (mouse) | | |  | | |
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| PR:P70552-1 | GTP cyclohydrolase 1 feedback regulatory protein isoform 1 (rat) | | |  | | |