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. Author manuscript; available in PMC: 2010 Sep 30.
Published in final edited form as: Circulation. 2007 Nov 12;116(22):2535–2543. doi: 10.1161/CIRCULATIONAHA.107.696583

Figure 6.

Figure 6

Class III mutant hearts had defects in AV node morphology. Hearts were sectioned and stained with Masson's trichrome. B and D, Higher magnifications of boxed areas in A and C, respectively. Note the fibrosis (yellow arrowheads in B) within 1 AV node and the twisted Y shape of the other AV node (D) compared with the ovoid compact control node (Figure 3A and 3B). Ao indicates aorta; AVN, AV node; His, His bundle; LV, left ventricle; and RV, right ventricle. Scale bar 500 μm(A and C) and 200 μm (B and D).