NDUFA13 and Ataxia: Spasticity and ataxia are relatively frequent findings in Leigh syndrome (each associated with 49 genes in the Leigh map diagnostic resource, https://www.vmh.life/#leighmap), but the choreoathetosis and dyskinesias reported in seven NDUFA13 deficient patients may be more discriminating (associated with 11 and two genes, respectively, in Leigh map).9 Seizures, reported in six cases, also occur relatively often in complex I deficiency and therefore are not a selective feature.