NCIt definition : Multidrug resistance protein 1 (1280 aa, 141 kDa) is encoded by the human ABCB1 gene.
This protein plays a role in both ATP-dependent transport of xenobiotics and resistance
to chemotherapeutics.;
Alternative definition : NCI-GLOSS: A protein that pumps substances out of cells. Cancer cells that have too
much p-glycoprotein may not be killed by anticancer drugs.;