But starting with mouse embryonic stem cells, researchers have succeeded in creating heart muscle that actually beats.

不过在老鼠胚胎干细胞上面，研究者们取得了突破，他们成功制造出了真正能搏动的人造心脏肌肉组织。

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In the laboratory, scientists have been able to induce embryonic stem cells to develop into heart muscle cells or insulin-producing cells of the pancreas.

在实验中，科学家们已经成功地诱导胚胎干细胞分化为心肌细胞和分泌胰岛素的胰腺细胞。

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The idea is to stitch or glue a patch of new tissue derived from embryonic stem cells over the damaged area of the heart to make the muscle viable again.

方法是将一个来源于胚胎干细胞的新组织补片“缝到”或“粘到”心脏的损伤区域，让心肌再次成活。

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Injecting stem cells into the heart muscle carries the risk of arrhythmia, said Techung Lee, associate professor of biochemistry at the State University New York at Buffalo.

CNN: Stem cells may offer promise for damaged hearts

About four months after each patient's original operation, when their hearts had stabilised, Dr Bolli used a catheter to deliver 1m of the newly bred stem cells to their damaged heart muscle.

ECONOMIST: Stem cells and medicine: Repairing broken hearts | The

They found that the stem cells produced growth factors that traveled to the heart, in addition to stimulating the muscle itself to make growth factors that also improved cardiac function.

CNN: Stem cells may offer promise for damaged hearts