Another yeast used for protein expression is Kluyveromyces lactis and the protein is expressed driven by a variant of the strong lactase LAC4 promoter.
Lactose intolerance is a non-allergic food sensitivity, and comes from a lack of production of the enzyme lactase, required to digest the predominant sugar in milk.
Lactose intolerance occurs when an individual is deficient in the enzyme lactase; which breaks down the lactose in the intestine.
Generally however, laboratory values are normal, but if there is a concurrent myocardial infarction (heart attack) or great stress to the heart, laboratory values may show increased cardiac markers like Troponin (I, T), CK-MB, Myoglobin, and LDH1 (Lactase Dehydrogenase isotype 1).