| lysin | (noun) any substance (such as an antibody) or agent that can cause lysis | - |
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| lysine | (noun) an essential amino acid found in proteins; occurs especially in gelatin and casein | - |
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| lysinemia | (noun) an inborn error of metabolism in which the lack of certain enzymes leads to an inability to metabolize the amino acid lysine; characterized by muscular weakness and mental retardation | - |
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| lysis | (noun) (biochemistry) dissolution or destruction of cells such as blood cells or bacteria | - |
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| (noun) recuperation in which the symptoms of an acute disease gradually subside | - |