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Analysis of 5′-RACE clones revealed two Cyp19 transcript variants (gonad p450 aroms 1 and 2) in the gonads and one Cyp transcript (brain p450 arom) in the brain that differed in their 5′-untranslated region (UTR). Since all cDNAs contained an identical open reading frame, it is considered that while Xenopus aromatase may be encoded by a single Cyp19 gene, it is transcribed by tissue-specific promoters,...