23182
Selenium concentration in biofortified mushrooms was 800 times higher compared with control samples grown on wheat straw from non selenium - rich areas ( 141 vs 0 . 17 mu gSeg ( - 1 ) dry weight ) .
 Chemical: Selenium; Chemical: selenium; Chemical: gSeg
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: gSeg