GLA activity for normal control samples (n = 105), mean 14.8 μmol/L/h (min–max, 5.3–32.8). GLA activity for affected samples (n = 6), mean 2.2 μmol/L/h (min–max, 0.8–4.0). GAA activity for normal control samples, mean 16.5 μmol/L/h (min–max, 8.3–34.3). GAA activity for affected samples (n = 7), mean 2.4 μmol/L/h (min–max, 1.4–3.6).