glu , gln , asp , asn , tau , gly , total gaba ( t-gaba ) , free gaba ( f-gaba ) , and homocarnosine levels and glu/gln , asp/asn , t-gaba/glu , f-gaba/glu , f-gaba/asp , and glu/asp ratios were similar in both samples ( student 's paired t-test ) .
C0061472
glu
C0017797
gln