This article was nominated for deletion on 29 July 2012 (UTC). The result of the discussion was keep.

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I read the comments re deleting the article. It is valuable to those who want to learn about the subject, but it needs a glossary or links to other Wikipedia articles. I've added one link. Will continue to plod through & will only make changes that clarify. NOT a biologist, only have 8 college credits in life science - topic is fascinating and rapidly amassing more knowledge - , I'm willing to search to find links to terminology as well as copy edit. Lorrie ( talk) 16:07, 28 May 2013 (UTC) reply

This section, first sentence, should list the "three distinct groups". The ensuing text does not clearly explain which are the three groups mentioned in the lead sentence. Lorrie ( talk) 16:44, 28 May 2013 (UTC) reply