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The introductory paragraph is concise and appropriately descriptive. Saying the molecule belongs to an "unusual" class of amino acids is a little vague, though. Maybe a little more description of beta amino acids would help (similar to what is written in the Occurrences section).
The Occurrences section is very descriptive and helpfully informative. I like that you briefly described the basics of an amino acid, then defined the differences between alpha and beta amino acids. There are two typos I noticed, though: There is an "I" right before the opening word "Amino"; also, in the 4th sentence, there is a double 'a' where there should only be one, and is lacking an 'a' before the word cell- it currently reads "...that is found in [a] cell but at aa greatly..." Finally, the last sentence is unclear and a run-on sentence. I would suggest breaking the sentence into two sentences and make sure each noun/pronoun has a verb if it needs one. Otherwise, I think that section looks very good. Acruz10 (talk) 01:21, 29 October 2012 (UTC)