How many amino a. are there? my teacher says 21 and she is asking the name and structure of the 21st one??
Answer:
I'm thinking it's probably Selenocysteine
http://en.wikipedia.org/wiki/selenocyste...
Look, they give you some advices in link
there are billions of amino acids. but naturally occurring, proteinogenic ones are 20. well, actually 21.
the so-called 21 is a Se-containing.
http://www.albany.edu/faculty/cs812/bio3...
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