1.5 weeks after a severe case of streptococcal tonsillitis, a 24-year-old man developed face edema and elevated blood pressure. He presents with hematuria and proteinuria of 1.2 g/L. In the blood, antistreptococal antibodies and low levels of complement components are detected. In this case, nephropathy has been caused by immune complexes, accumulations of which can most likely be found in the microvascure of