5199
In studies of many different phenotypically distinct cells , the CRE of the somatostatin gene promoter is a prototype of a highly cAMP - responsive element regulated by CREB .
 somatostatin gene promoter, CREB
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 somatostatin gene promoter, CREB