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All four FXG types associate with polyA+ RNA. Confocal micrographs of immunostaining for FXR2P (green) to identify FXGs, and in situ hybridization for polyA to identify polyadenylated RNAs (red). PolyA-associated FXGs (arrows) include: (a) Type I FXGs in CA3 associational fibers; (b) Type II FXGs in olfactory sensory neuron axons; (c) Type III FXGs in the reticular formation within the medulla; and (d) Type IV FXGs in the deep cerebellar molecular layer. Scale bar = 5 μm
