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Does treatment using embryonic stem cells (ESCs) help improve heart function following a heart attack? Each sheep in the study was randomly assigned to the ESC or control group, and the change in their hearts' pumping capacity was measured in the study. A positive value corresponds to increased pumping capacity, which generally suggests a stronger recovery.

Variables:

• trmt - a factor with levels ctrl esc

• before - a numeric vector

• after - a numeric vector

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Source

http://www.thelancet.com/journals/lancet/article/PIIS0140-6736(05)67380-1/abstract

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