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Review Question - QID 103797

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QID 103797 (Type "103797" in App Search)
A 72-year-old nursing home resident is complaining of pruritis. She is noted to have multiple, tense blisters on her trunk as well as the flexor surfaces of her extremities. The blisters have an erythematous base. You are unable to extend the blisters when you apply lateral traction. You suspect an autoimmune bullous dermatosis. Which of the following is the cause of the likely condition?