“…Among its members, at least five (ABCC1, ABCC2, ABCC3, ABCC4 and ABC5) are potentially involved in mediating drug resistance (Cole et al, 1992 ; Kool et al, 1997 ; Evers et al, 1998 ). Members of the ABCC subfamily can fall in one of two different subclasses, “short” and “long” (Kast and Gros, 1997 ; Bakos and Homolya, 2007 ; Honorat et al, 2009 ). The so called “long” ABCC transporters (ABCC1, 2, 3, and 6) present an additional N- terminal MSD (MSD0), of approximately 250 amino acids, a unique feature of these specific transporters (Figure 2B ) in comparison to the “short” transporters.…”