7947
Results support the hypothesis that endogenous corticotropin - releasing factor , perhaps acting at a peripheral binding site , suppresses the active behavioral response characteristic of pups during the early phase of isolation in novel surroundings .
 endogenous corticotropin - releasing factor
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 endogenous corticotropin - releasing factor