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Ex vivo autoradiography and immunostaining of adjacent sections of tumor and peritumoral pancreas. (A) Unblocked section. (B) Section blocked with 1mM lactose solution prior to exposure to [18F]FEL. (C) Immunohistochemical staining of a section adjacent to that shown in (A) for HIP/PAP. (D) Amplification of a small section of (C).
