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OASTL and l-Cys desulfhydrase activity in transgenic potato plants. Total extracts of soluble proteins were prepared and the OASTL (A) and l-Cys desulfhydrase (B) activities were determined in spectrophotometric assays by measuring either the formation of Cys (A) or by measuring the formation of H2S from Cys (B). Activities are given as nanomoles (minutes × milligrams protein)−1.
