21238
Mechanistically , the inhibitory effect of MeHg on the induction of CYP1A1 coincided with an increase in heme oxygenase - 1 ( HO - 1 ) mRNA levels .
 Chemical: MeHg; Chemical: heme
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: MeHg; Chemical: heme