560
Internal controls over the volume of milk suckled do not appear until infant rats are about 2 weeks of age at which time gastric distension , milk , systemic dehydration , and intestinal hormone cholecystokinin suppress milk intake derived through suckling .
 GENE: intestinal hormone cholecystokinin
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: intestinal hormone cholecystokinin