2536
Here , we describe the isolation of bovine and rat GHF - 1 cDNA clones .
 bovine and rat GHF - 1 cDNA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 bovine and rat GHF - 1 cDNA