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Four healthy people in their twenties got involved in injuries resulting in damage and death of a few cells of the following. Which of the cells are least likely to be replaced by new cells?

1. Liver cells
2. Neurons
3. Malpighian layer of the skin
4. Osteocytes

Correct answer: Neurons

Solution

Neurons are highly specialized cells with very limited ability to undergo mitosis, so lost neurons are usually not replaced by new ones. In contrast, liver cells, skin cells, and bone-related cells have much better regenerative capacity.

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