modified amino acid biosynthetic process modified histidine biosynthetic process https://github.com/geneontology/go-ontology/issues/28908 cellular histidine derivative biosynthesis cellular histidine derivative synthesis cellular modified histidine biosynthesis cellular histidine derivative anabolism 2011-08-01T03:49:39Z cellular histidine derivative biosynthetic process cellular modified histidine synthesis cellular modified histidine anabolism biological_process histidine derivative biosynthetic process The chemical reactions and pathways resulting in the formation of compounds derived from histidine, 2-amino-3-(1H-imidazol-4-yl)propanoic acid within a cell. cellular modified histidine formation ai GO:0052703 cellular histidine derivative formation