has part has part has_part characteristic of has modifier part of N-acetyl-L-aspartic acid abnormal brain morphology abnormal brain N-acetyl-L-aspartic acid level 2022-06-09T20:13:38Z any anomaly in the amount of the derivative of the amino acid aspartic acid in which the acyl group is acetyl and has the chemical formula C6H9NO5 in the brain tissue aberrant brain N-acetyl-L-aspartate level abnormal brain N-acetyl-L-aspartate level aberrant brain NAA level abnormal brain NAA level MP:0021142 abnormal brain (2S)-2-acetamidobutanedioic acid level abnormal brain N-Acetylaspartic acid level abnormal amino acid derivative level amount abnormal brain