During mammalian heart development, the clustered genes encoding peptide hormones, Natriuretic Peptide A (; ANP) and B (; BNP), are transcriptionally co-regulated and co-expressed predominately in the atrial and ventricular trabecular cardiomyocytes. After birth, expression of and a natural antisense transcript becomes restricted to the atrial cardiomyocytes. Both and are induced by cardiac stress and serve as markers for cardiovascular dysfunction or injury.
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