SOD1 and amyotrophic lateral sclerosis: The expression of caspase‐1 is reduced in in transgenic mice expressing mutant human SOD1 with a substitution of glycine to alanine in position 93 (mSOD1(G93A)), and intraventricular administration of caspase‐1 inhibitor zVAD‐fmk can delay the onset and mortality of ALS.316