What is a subunit? How can I determine where Docosahexaenoic Acid has a subunit?
Since this is not my area of expertise, I searched Google under the key words "'Docosahexaenoic Acid' subunit" and "DHA subunit" to get these possible sources:
http://www.ionchannels.org/showabstract.php?pmid=8938727
http://www.iovs.org/cgi/content/full/44/7/3170
http://www.pnas.org/cgi/content/abstract/100/14/8188?ck=nck
http://www.jbc.org/cgi/content/full/281/32/23129
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=166204
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.
I hope this helps. Thanks for asking.