A 58-year-old man presents with multiple lesions on his upper trunk, face, and scalp. The structure marked **A** in the diagram shows superficial crusted erosions with a characteristic 'corn flake' appearance in a seborrheic distribution. Direct immunofluorescence reveals intercellular IgG and C3 deposits in the superficial epidermis. Which of the following autoantibodies is most likely responsible for the pathogenesis of this condition?
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