part of part of has part has part characteristic of has modifier proteinogenic amino acid Aminoaciduria Increased proteinogenic amino acid level in urine An elevated level of a proteinogenic amino acid in the urine. These are the 23 alpha-amino acids that are precursors to proteins, and are incorporated into proteins during translation. The group includes the 20 amino acids encoded by the nuclear genes of eukaryotes together with selenocysteine, pyrrolysine, and N-formylmethionine. abnormal increased amount urine