Reply to the comment of Ana I. Alvarez and Gracia Merino regarding "Assessment of ABCG2-mediated transport of xenobiotics across the blood-milk barrier of dairy animals using a new MDCKII in vitro model" by Wassermann et al. 2013.

Reply to the comment of Ana I. Alvarez and Gracia Merino regarding "Assessment of ABCG2-mediated transport of xenobiotics across the blood-milk barrier of dairy animals using a new MDCKII in vitro model" by Wassermann et al. 2013.