2274
There was no significant correlation between baseline PC40 methacholine and the maximal fall in Vp30 after either the first ( 12 micrograms ) or the second dose ( 24 micrograms ) of platelet activating factor .
 platelet activating factor
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 platelet activating factor