1271
These data show that PTH and cAMP can repress collagen promoter activity in calvariae from transgenic mice , suggesting that the alpha 1 ( I ) collagen promoter may contain cis elements down - stream of - 2 . 3 kilobases that mediate PTH and cAMP repression of collagen gene expression in bone .
 GENE: PTH; GENE: collagen promoter; GENE: alpha 1 ( I ) collagen promoter; GENE: PTH; GENE: collagen gene
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: PTH; GENE: collagen promoter; GENE: alpha 1 ( I ) collagen promoter; GENE: PTH; GENE: collagen gene