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- Present address: National Institute for Biotechnology and Genetic Engineering, P.O. Box 577, Jhang Road, Faisalabad, Pakistan.
- Corresponding author. Mailing address: Department of Microbiology, Ohio State University, 484 West 12th Avenue, Columbus, OH 43210–1292, U.S.A. Phone: (614) 292–3379. Fax: (614) 292–8120. E‐mail: [email protected]‐state.edu.