15638
Lastly , Se availability was quantified by mass spectrophotometry to determine the amount of Se in the cell culture media , the Se background due to the foetal calf serum supplement and the contribution from the two selenocompounds used in the treatments .
 Chemical: Se; Chemical: Se; 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: Se; Chemical: Se; Chemical: Se