x3 x4 x1 x2 x3 x4 x5 p2 x3 p1 x1 p6 x1 p8 x2 p7 x2 p9 x3 p11 x4 p10 x4 p5 x3 p4 x3 p3 x1 p12 x1 basolat x5 apical