20573
Compared with the Pb group , Se supplements shown down regulated the level of LDH , the neurons apoptosis and the serum MDA , and up regulated the level of serum SOD .
 Chemical: Pb; Chemical: Se; Chemical: MDA
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: Pb; Chemical: Se; Chemical: MDA