6448
The most favorable effects were seen for dydrogesterone and dienogest , where the first , dydrogesterone , significantly reduced SRD5A1 , AKR1C2 and AKR1C3 expression , and additionally had a nonsignificant impact on progesterone receptor B ( PR - B ) protein levels .
 dydrogesterone, dienogest, dydrogesterone, progesterone
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 dydrogesterone, dienogest, dydrogesterone, progesterone