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. 2020 Jan 2;156(2):191–195. doi: 10.1001/jamadermatol.2019.4126

Figure 2. Phospho–Extracellular Signal-Regulated Kinase (ERK) Labeling Before Erlotinib Treatment in Patients 1 and 3.

Figure 2.

A, Strong nuclear staining (arrowheads) of numerous keratinocytes in the upper part of the hyperplastic epidermis below a thick parakeratosis area (original magnification ×100). B, Strong nuclear staining (arrowheads) of numerous keratinocytes in the hyperplastic epidermis (original magnification ×100).