3856
To clarify the mechanisms that regulate transcription of the GTP cyclohydrolase I gene and to generate multiple species of mRNA , we isolated genomic DNA clones for the human and mouse GTP cyclohydrolase I genes .
 GENE: GTP cyclohydrolase I gene; GENE: GTP cyclohydrolase I genes
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: GTP cyclohydrolase I gene; GENE: GTP cyclohydrolase I genes