The heart is a powerful pump made of muscle (myocardium). It is divided into four chambers: the upper two atria are the receiving chambers and the lower two ventricles are the pumping chambers.

can lead to an enlarged heart. In atrial fibrillation, the heart’s upper chambers beat rapidly and irregularly. This causes ...

Many transgenic models of dilated cardiac hypertrophy have been ... we included overexpression in the heart of green fluorescence protein (GFP), a molecule believed to be biologically inert ...