10837
Full expression of selenoproteins requires modification of tRNA ( [ Ser ] Sec ) , including N ( 6 ) - isopentenylation of base A ( 37 ) .
 Ser, Sec
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Ser, Sec