15635
An inorganic ( sodium selenite , Na2SeO3 ) and organic ( selenocysteine , Cys - Se - Se - Cys ) selenocompound have been used as Se sources .
 Chemical: sodium selenite; Chemical: Na2SeO3; Chemical: selenocysteine; Chemical: Cys - Se - Se - Cys; Chemical: Se
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: sodium selenite; Chemical: Na2SeO3; Chemical: selenocysteine; Chemical: Cys - Se - Se - Cys; Chemical: Se