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D- and L- configuration of amino acids

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tortillazilla:
Hello! I'm still confused about how the D- and L- configuration of amino acids are determined. Some references say that counterclockwise CORN is L- and clockwise CORN is D-, while some sources say otherwise.

I tried naming the oligopeptide in the photo and came up with L-phenylalanyl-L-seryl-D-cysteinyl-D-tryptophan. Can someone tell me if this is correct? Thank you so much!

Babcock_Hall:
I am not familiar with the acronym CORN.  The L,D system is based on L and D glyceraldehyde, and for the amino acids there is not a perfect correlation between the L,D system and the R,S system.  I did not check all of the configurations, but I disagree with your assignment of cysteine.

tortillazilla:
Ooh, totally missed that. Thank you so much!

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