A 66-year-old woman comes to the

physician because of pruritic blister formation. Physical examination

shows multiple 1–3 cm bullae on the palms, soles, lower legs,

and inguinal folds. Gentle rubbing of the skin (epidermis) results in

sloughing of the epidermis. Immunofluorescence studies of a perilesional skin

biopsy show the deposition of antibodies. In which of the following areas are

most likely the depositions of antibodies?