FIGURE 4. WR% of ^99mTc-MIBI in group 1 (both Pgp and MRP negative) is significantly slower than that of group 2 (both Pgp and MRP positive), group 3 (Pgp positive and MRP negative), and group 4 (MRP positive and Pgp negative). Difference between groups 2, 3, and 4 is not significant (NS).