Harris: Different Classes of Proteins

This photograph is of insulin, a hormone.
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Raw beef contains hemoglobin, a transport protein.
(Organism is Bos primigenius.)
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My hair contains the structural protein keratin.
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The meat tenderizer in this photograph contains the enzyme bromelain.
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Ovalbumin, a storage protein, is the main protein found in egg white.
(Organism is Gallus domesticus.)
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