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For a long time it was assumed that water passed through the membrane un-facilitated due to its small size. However, a water transporter was discovered in 1992 and it was named aquaporin. Aquaporin is a single subunit protein that is barrel-shaped and open to both sides of the membrane (it completely transverses the width of the membrane). Draw and name the secondary structural feature most likely to comprise the bulk of the structure of aquaporin

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