An experimental treatment for amyotrophic lateral sclerosis (Lou Gehrig's disease),which causes gradual loss of the ability to move,sends four genes into cells sampled from a patient's skin.This procedure reprograms the cells,which are then exposed to molecules and genes that stimulate them to develop as healthy versions of the cells affected in the disease.These cells are implanted into the patient.They are

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The treatment involves reprogramming cells from the patient's skin, which suggests that they are somatic cells (not embryonic stem cells). The fact that these cells are programmed to develop into healthy versions of the affected cells suggests that they have been induced to become pluripotent stem cells. Therefore, the correct answer is C) induced pluripotent stem cells.

An Experimental Treatment for Amyotrophic Lateral Sclerosis (Lou Gehrig's Disease),which