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Fig. 6. Smooth muscle differentiation in wild-type kidneys and ureter. Hematoxylin and Eosin (H&E; A,C,E,G,I,K) and immunohistochemical staining for smooth muscle {alpha}-actin (SM {alpha}-actin, brown; B,D,F,H,J,L) in the proximal (A,B,E,F,I,J) and distal (C,D,G,H,K,L) ureter at the indicated stages. Arrows in B indicate scattered cells that produce SM {alpha}-actin. Scale bar: 50 µm.