In the article that begins on page 131 of the June 2009 issue, there was an error in the title of Table 1 on page 134. The perfusate flow rate was incorrectly given as 0.3 ml/min; the correct perfusate flow rate is 0.3 [mu]l/min. This error has been noted in the online version of the article, which is available at http://www.jnnonline.com.

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