L side of the transwell, and epithelial integrity was measured at 30 min and 2, 4, 9, and 24 h by using the Minicell-ERS instrument. The data shown are the averages from duplicate wells ?1 standard error of the mean after product addition.Page 4 of(page number not for citation purposes)Journal of Translational Medicine 2007, 5:http://www.translational-medicine.com/content/5/1/p24 (pg/ml)of the pla