6199
Previous studies investigated the effect of permethrin ( PERM ) administered at 34 mg / kg , a dose close to the no observable adverse effect level ( NOAEL ) from post natal day ( PND ) 6 to PND 21 in rats .
 permethrin, PERM
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 permethrin, PERM