Immunohistochemistry of cellular infiltrates. (A) Immunostaining of liver infiltrates with anti-CD3 antibody. Closed arrows identify positive staining cells in each infiltrate (OM × 720). (B) Immunostaining of liver infiltrates with anti-F4/80 antibody. Closed arrows identify positive staining cells in each infiltrate (OM × 720). Sections shown in (A) and (B) are serial sections.