And ABC stands for ATP binding cassette. Now, actually this important class of ATP driven proteins was discovered as a result of our study of human disease. And what we studied was cancer. So we essentially took a tumor, we extracted cancer cells from that tumor and then we grew those cancer cells in a petri dish. Now, the cancer cells were exposed to some type of drug and what we saw happen was initially the drug carried out its effect and killed off some of those cancer cells. But over time, what happened was those cancer cells gained multidrug resistance MDR.