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gel by the method of Laemmli . The transformants
of E. coli induced with IPTG were collected by
centrifugation, washed with 50 mM acetate bu¡er (pH
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solution was subjected to SDS^PAGE. To detect esterases
including lipases, the gel was soaked at room temperature
in a solution containing 1-naphthylcaprylate instead of 1-
naphthylacetate (Sigma) and Fast Red TR Salt (Aldrich),
and the activity was visualized as a red band .
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