13541
Individuals with variant Cys / Cys homozygote showed higher levels of sperm 8 - OHdG than wide - type homozygote carriers ( Ser / Ser ) .
 Chemical: Cys; Chemical: Cys; Chemical: 8 - OHdG; Chemical: Ser; Chemical: Ser
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: Cys; Chemical: Cys; Chemical: 8 - OHdG; Chemical: Ser; Chemical: Ser