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Four lumpy globin subunits pack together in this organic hemoglobin protein model, each cradling its own heme group. The alpha and beta chains form rounded, bubbly lobes that meet in a compact cluster, and every subunit holds a small pocket with a central ring and radiating spokes marking the heme. The rough surface gives it the look of a real space-filling molecular model. It makes a hands-on teaching piece for a biology or chemistry classroom, a medical study desk or a shelf of protein models.

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