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A Klebsiella pneumoniae bacterium shown as a cutaway rod, revealing what sits under its thick bumpy polysaccharide capsule. Inside, layered cell walls surround a tangled chromosome at the centre, small plasmid rings and granules scattered through the cytoplasm, while thin fimbriae curl off the outer surface. The studded capsule texture contrasts nicely with the smooth inner layers. A clear teaching model for microbiology, biology and nursing classes, or an unusual display piece for a lab or clinic.

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