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Taken together , these data indicate that a PKA - mediated signaling pathway mediates GnRH activation of CREB at low - pulse frequencies , playing a significant role in the decoding of the hypothalamic GnRH signal to result in frequency - dependent FSH beta activation .
 Chemical: GnRH; Chemical: GnRH
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: GnRH; Chemical: GnRH