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We regret that the article “Expression and Characterization of Escherichia coli Prolidase with Organophosphorus Compounds” by J.-K. Hong, M.-S. Park, F. M. Raushel, and Y.-H. Khang (Biotechnol. Bioprocess Eng. 8: 126-129, 2003) must be retracted. The corresponding author (Y.-H. Khang) made an unintentional mistake in submitting the manuscript without the permission of the co-authors. In addition, more recent experiments to measure the kinetic constants of the E. coli prolidase have determined that those reported in the article are incorrect. As a consequence of these problems, the article is being retracted with permission of the co-authors. The corresponding author apologizes for this mistake and for any problems that he may have caused.
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