
On the Cover
Focused ion beam scanning electron microscopic image shows the major structures within a single heart cell of a healthy adult mouse, highlighted in color via computer enhancement--mitochondrial membranes (red), mitochondrial interior (green), sarcoplasmic reticulum (dark blue), fat droplets (cyan/greenish blue) and the contractile apparatus (pink, yellow, lighter blue). February is American Heart Month.
Brian Glancy, NHLBI