SQOR and Dravet syndrome: Expression of the further H2S-decomposing enzymes SQR was comparable in DS and wild-type control brains, and expression of the H2S-decomposing enzyme SUOX was lower in DS brains than in wild-type brains and so was the expression of superoxide dismutase 1 (SOD1), which acts as an antioxidant enzyme, but has also been implicated in H2S decomposition [36] (Fig. 2).