23183
Seventy - five percent of the selenium was extracted after in vitro simulated gastrointestinal digestion and investigation of the selenium molecular fractions by size exclusion HPLC - ICP - MS revealed that proteins and any other high molecular weight selenium - containing molecule were hydrolyzed to peptides and low molecular weight selenocompounds .
 Chemical: selenium; Chemical: selenium; 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: selenium; Chemical: selenium