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Cystathionine lyase activity in CEs of L. lactis strains towards cystathionine (A), expressed as namolar concentrations of mercaptide formed from conversion of free thiols by DTNB, or methionine (B), expressed as parts per billion of DMDS formed. Nisin (2.5 ng/ml) was added where indicated. The values on the y axes are given in a 10log-unit scale. Values are the means of five independent measurements. Standard errors were less than 10% for each value indicated.
