Most influenza strains can be inactivated easily by disinfectants and detergents. Spoilage enzymes are also inactivated during pasteurization. These vaccines contrast to those produced by "killing" the virus (inactivated vaccine). The enzyme is therefore easily inactivated by EGTA. Salivary amylase is inactivated in the stomach by gastric acid. The outer cortex consists of groups of mainly inactivated B cells called follicles. They can be inactivated easily by disinfectants and detergents. The remainder had been inactivated or redesignated as very heavy bombardment (B-29). The poison tremetol is not inactivated by pasteurization. X chromosomes that lack the Xist gene cannot be inactivated. Many mouse models are named after the gene that has been inactivated. This protein cannot be inactivated normally, through GTP hydrolysis, and is thus "stuck on". Lamotrigine is inactivated by glucuronidation in the liver. The regiment was inactivated 15 July 1942. In 1944 the Marine Engineer Regiments were inactivated.