globin

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Diagram tracing the evolutionary history of globin genes from a single ancestral globin gene, with branching lines and dots marking gene duplication events over millions of years, leading to myoglobin and various hemoglobin genes on chromosomes 16 and 11.

globin

biology

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hemoglobin
…four heme groups surrounding a globin group, forming a tetrahedral structure. Heme, which accounts for only 4 percent of the weight of the molecule, is composed of a ringlike organic compound known as a porphyrin to which an iron atom is attached. It is the iron atom that binds oxygen…
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…four heme groups surrounding a globin group, forming a tetrahedral structure. Heme, which accounts for only 4 percent of the weight of the molecule, is composed of a ringlike organic compound known as a porphyrin to which an iron atom is attached. It is the iron atom that binds oxygen…
Read More