Glycine can be synthesised from all except
Glycine can be formed from Serine which can be reversibly formed from Alanine.Glycine aminotransferase can catalyze the synthesis of glycine from glyoxylate and glutamate or alanine. This reaction strongly ours synthesis of glycineRef: DM Vasudevan - Textbook of Biochemistry, 7th edition, page no: 210
Aspaate
Alanine
Glycoxylate
Glutamate
Metabolism of protein and amino acid