Neurodevelopmental Disorder, Mitochondrial, with Abnormal Movements and Lactic Acidosis, with or Without Seizures, also known as nemmlas, is related to visual epilepsy and lactic acidosis. An important gene associated with Neurodevelopmental Disorder, Mitochondrial, with Abnormal Movements and Lactic Acidosis, with or Without Seizures is WARS2 (Tryptophanyl TRNA Synthetase 2, Mitochondrial). Affiliated tissues include brain and skeletal muscle, and related phenotypes are intellectual disability and global developmental delay