among eight murnac dipeptides tested , murnac-l-ala-d-isogln , murnac-l-ala-d-gln , murnac-l-ala-d-glu , and murnac-l-ser-d-isogln were found active as an adjuvant in the stimulation of the primary and secondary reaginic anti-oa antibody production in a similar way to the cell wall pg and their fragments .
C0017797
gln
C0061472
glu