Hi Next Step,
This is probably a quick and easy question, but it is something I am stuck on. When I look up the structure of amino acids, why do I find two different structures for the same amino acid? I attached a picture of the two versions of Histidine to show you what I am talking about.
On the left histidine, the R group is attached to the alpha carbon. The histidine on the right shows the R group attached to the amino group. Can you help me figure out why this is?
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