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The GnRH receptor gene ( Gnrhr ) , crucial for gonadotrope function , is expressed in the pituitary gland from embryonic day 13 . 5 onward , well before LH and FSH beta - subunits .
 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