Fig. 3

Metabolic pathway enrichment analysis of differential amino acids. The featured amino acids were enriched in KEGG database, and alanine, aspartate and glutamate metabolism, D-glutamine and D-glutamate metabolism, tryptophan metabolism, glycine, serine and threonine metabolism, aminoacyl-tRNA biosynthesis, arginine and proline metabolism pathways showed most alterations in CRC occurrence