A 3-Year-Old Boy Is Brought to the Office by His

A 3-year-old boy is brought to the office by his parents.  They say that the child cannot keep up with his cousin, who is the same age.  The boy climbs up from a squat by using his hands to push off the ground and his lower extremities.  His calves appear enlarged on physical examination.  This patient's condition is most likely associated with which of the following?

A) Endomysial inflammatory infiltration
B) Endoneural inflammatory infiltration
C) Mutation affecting a muscle ion channel protein
D) Mutation affecting a myelin protein
E) Mutation affecting a sarcolemma-cytoskeleton linker protein
F) Mutation affecting a sarcomere protein

Correct Answer:

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