The correct structure of the tripeptide Glycine -- Alanine -- Glycine is
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While writing peptide structures, the amino acids are written from the
\[
\boxed{\text{N-terminal} \rightarrow \text{C-terminal}.}
\]
Thus,
\[
\boxed{
\text{Gly--Ala--Gly}
=
\mathrm{H_2NCH_2CONHCH(CH_3)CONHCH_2COOH}.
}
\]