2019
We determined effects of prenatal arsenic exposure on hepatic Hsp70 and Hsc70 expression by Western blot and on DNA methylation by methyl acceptance assay during prenatal and postnatal development .
 Chemical: arsenic; Chemical: methyl
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: arsenic; Chemical: methyl