Complement immunoreactivity in plaques, neurons, and neurofibrillary tangles. Fig. 1A: iC3b-stained plaques and neurons, MCI specimen; Fig. 1B: C9-stained plaques, AD specimen; Fig. 1C: iC3b-stained glial cells, AN specimen; Fig. 1D, iC3b staining of possible NFT, AD specimen (Figs. 1A – 1C, bar = 50 μm; Fig. 1D, bar = 12.5 μm).