Additional file 1.

Proposed mechanisms for MDR reversal by the tested Chinese medicinal herbs. The herbs are grouped into three categories, namely active ingredients, extracts and formulae. Pgp involvement is particularly considered: (+) inhibition on Pgp; (-) no effect on Pgp.

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Chai et al. Chinese Medicine 2010 5:26   doi:10.1186/1749-8546-5-26