If we can understand how the generation of new cardiomyocytes is regulated , it may be potentially possible to develop pharmaceuticals that promote this process to stimulate regeneration after for example, a heart attack, Frisen said.

　　That could lead to treatment that helps restore damaged hearts.

　　A lot of people suffer from chronic heart failure, noted co-author Dr. Ratan Bhardwaj.

　　Ratan Bhardwaj, also from the Karolinska Institute. Chronic heart failure arises from heart cells dying, he said.

　 　With this finding, scientists are opening the door to potential therapies to having ourselves heal ourselves, Bhardwaj said. Maybe one could devise a pharmaceutical agent that would make heart cells make new and more cells to overcome the problem they are facing.

　　 But barriers remain. According to Bhardwaj , scientists do not yet know how to increase heart cell production to a rate that would replace cells faster than they are dying off, especially in older patients with heart failure. In addition, the number of new cells the heart produces was estimated using healthy hearts-whether the rate of cell tumover in diseased hearts is the same remains unknown.

　　31. The human heart stops producing cardiac cells

　　A. when a person becomes old

　　B. as soon as a person gets sick

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