5044
Cadmium ( Cd ) - induced oxidative stress down - regulates the gene expression of DNA mismatch recognition proteins MutS homolog 2 ( MSH2 ) and MSH6 in zebrafish ( Danio rerio ) embryos .
 Chemical: Cadmium; Chemical: Cd
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Cadmium, Cd 
Answer:
 Chemical: Cadmium; Chemical: Cd