25337
DHA was preferentially located at the sn - 2 position in both DHA - containing TAGs studied , while EPA was either observed at near equal levels in all positions , or predominantly at the sn - 1 and - 3 positions in some cases .
 DHA, DHA, TAGs, EPA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 DHA, DHA, TAGs, EPA