![masthead image of adult mouse heart cell Electron microscopic image of single heart cell in an adult mouse](/sites/nihrecord/files/styles/thumbnail_small/public/2019/February-8/HeartColoredEM%20%28002%29%20hi-res%20Glancy.jpg?itok=CRFFlTGm)
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