A paper on extraction, curation and comparison of literature data for a key transporter in drug discovery P-glycoprotein Uniprot:P08183 (aka MDR1, pgp, etc). It details some interesting comparisons of different assay formats, readouts, cell-backgrounds and so forth.
Here's a link to the paper (It should be Open Access, but isn't at the moment :( ).
%T Annotating Human P-Glycoprotein Bioassay Data %J Mol. Informatics %A B. Zdrazil %A M. Pinto %A P. Vasanthanathan %A A.J. Williams %A L.Z. Balderud %A O. Engkvist %A C. Chichester %A A. Hersey %A J.P. Overington %A G.F. Ecker %D 2012 %V 31 %O DOI: 10.1002/minf.201200059