Fig. S2.

Fibrosis and connexin expression in the NCX KO SAN and atria. (A) Representative light micrographs of Masson’s trichrome staining of the sinoatrial node (SAN), right atrium (RA), and left atrium (LA) in WT (Upper) and KO (Lower). Blue areas correspond to fibrosis. (B) Summary plots of percent area with fibrosis in six WT and four NCX KO tissues. (C) Expression level of Cx40, Cx43, and Cx45 measured by qPCR, relative to the housekeeping gene GAPDH. *P < 0.05, **P < 0.01, ***P < 0.001 by unpaired t test.