Human primary neurons were untreated (A) or treated with nocodazole (5 μg/ml) (B) or nocodazole plus IIIB gp120 (5 nM) for 6h. Nocodazole was added 15min before IIIB gp120 was added. Neurons were fixed, and stained for MBL (green), MAP2 (red), gp120 (magenta) and DAPI (blue). A,B, Localization of MBL:MAP2 complexes (closed arrows; yellow indicates co-localization) in neurites and neuronal soma. C, Localization of MBL:MAP2:gp120 complexes predominantly in neuronal soma only (open arrows; white indicates co-localization). Scale bar, 10 μm.