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VOLUME 274 (1999) PAGES 21893–21899
PAGE: 21896
In the published version of Fig. 2, the representative image of a 24-h competitive RT-PCR experiment was incorrect. The correct image is now provided in the revised Fig. 2, shown below. The bar graph in Fig. 2 remains unaffected. This correction does not change the interpretation of the results or the conclusions.
