5227
When the mice were exposed to OVA and to high and intermediate doses of iron oxide submicron - or nanoparticles , the OVA - induced allergic response was significantly inhibited , as evidenced by the decrease in eosinophil cell influx and specific IgE levels .
 iron oxide
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 iron oxide