Abstract
Summary The activity of liver histidine ammonia-lyase differs markedly among several different strains of inbred mice. Variations in urocanase activities were less marked and were not correlated with histidine ammonia-lyase levels. Enzyme levels in the F 1 progeny of matings between some of these strains indicate that two types of strains with low histidine ammonia-lyase levels exist. It is postulated that in one of these a mutation has occurred in the structural gene for histidine ammonia-lyase while in the other a mutation has occurred in a regulatory element.
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