Glucose (二)碳骨架的来源 Glucose 6-phosphate Ribose 5- phosphate Histidine Erythrose 4- 3-Phosphoglycerate Serine phosphate Glycine Phosphoenolpyruvate Cysteine Tryptophan Alanine Phenylalanine Pyruvate Valine Tryosine Leucine Oxaloacetate a-Ketoglutarate Aspartate Glutamate Asparagine Methionine Glutamine Threonine Proline LvsIe Arginine Isoleucine （二）碳骨架的来源