A 14-year-old child is brought to the dermatologist for evaluation of facial skin lesions, as shown. The child has a history of developmental disability and seizure disorder. A mutation in a protein that results in modification of which of the following processes is implicated in the patient’s condition?

A. Cellular metabolism

B. Cellular proliferation

C. Intercellular transport

D. Nutrient storage

E. Structural support

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