1856
The divergence in primary structure between the sheep CRF1 and the other mammalian CRF1s is primarily localized to the extracellular amino terminal domain of the receptor ( 18 of 22 divergent residues , ovine vs human CRF1 ) .
 GENE: CRF1; GENE: mammalian CRF1s; GENE: human CRF1
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: CRF1; GENE: mammalian CRF1s; GENE: human CRF1