Re: The meaning of PCA

Wed, 20 Mar 1996 11:50:29 +0200 (MET)

>Question: What has happened to the
>two carbon atoms (gamma and delta)
>required to form the ring?

One possibility is that when the structure was determined, the software
tools were less user-friendly than they are today. So instead of trying
to create all the necessary dictionary entries for pyroglutamate, the
people doing the structure determination did the best they could by
building in an alanine.