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Analysis of the gastrointestinal hydrolysates by anion exchange HPLC - ICP - MS showed that the bioaccessible selenium was mainly present as selenomethionine , a good bioavailable source of selenium , which accounted for 73 % of the sum of the detected species .
 Chemical: selenium; Chemical: selenomethionine; Chemical: selenium
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: selenium; Chemical: selenomethionine; Chemical: selenium