1.8.1.13	2 gamma-glutamylcysteine + NADP+ = bis-gamma-glutamylcystine + NADPH + H+	highly specific	-	
1.8.1.13	2 gamma-glutamylcysteine + NADP+ = bis-gamma-glutamylcystine + NADPH + H+	highly specific. Not identical with EC 1.8.1.7 glutathione-disulfide reductase or EC 1.8.1.14 CoA-disulfide reductase	-