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General pathology and immunology

Apoptosis, autophagy, and programmed cell death

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SAMPLE QUESTION

In an embryo, interruption of a cell-elimination pathway leaves living tissue bridges between developing digits. In a separate adult tissue exposed to injury, dying cells swell, rupture, and release their contents. Interruption of a signaling component of the death machinery markedly reduces this death without changing the initial injury.

Which interpretation best accounts for both observations?