Tissue IgG1 immune complex deposits.

<p>Direct immunofluorescence using FITC-conjugated anti-IgG1 antibodies on cryostate sections from female BALB/c wild type (A, C) and FcRγ^−/− (B, D) mice treated with 15 mg/l HgCl₂ in the drinking water for 5 weeks. Heavy granular staining in splenic vessel walls (A) and renal mesangium (C) in wild type mice, but only slight deposits in the corresponding tissues of FcRγ^−/− mice (B, D).