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Strong α7-nAChR immunopositivity (“Class 3” of α7-nAChR-Index) in the Kölliker-Fuse nucleus (KFN). (A) Normal structure and (B) hypoplasia of the KFN in two e-SIDS cases (both died in the first postnatal week). (A,B) α7-nAChR immunostaining; magnification: 100×.
