3640
Thus , similar to mammals , maintaining at least a 1 : 1 molar ratio of Se and Hg is of great physiological importance in the white sturgeon .
 Chemical: Se; Chemical: Hg
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: Hg