21. Other GABA metabolites can also be identified in urine such as glycine . 22. The product also contains glycine and other rabbit plasma proteins. 23. This enzyme participates in glycine , serine and threonine metabolism. 24. Glycine and serine catabolism in and out of the mitochondria.25. Aspergillomarasmine B differs in that the last alanine is replaced by glycine . 26. This dipeptide is then condensed with glycine by glutathione synthetase to form glutathione. 27. Another example is strychnine, a affinity of the glycine receptor for glycine. 28. Another example is strychnine, a affinity of the glycine receptor for glycine . 29. There are two types of neurotransmitter receptors : glycine . 30. Most are inhibitory using either gamma-Aminobutyric acid or glycine as neurotransmitters.