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Recurrent tumor biopsies.
Top row: Hematoxylin–eosin (H&E)-stained formalin-fixed tissue; note that B1811381 has cryoartifacts. B1726325 has low levels of residual tumor cells in this biopsy. Bottom row: Anti-epidermal growth factor receptor (EGFR) staining. Black bars represent 20 μm.
