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Which of the following proteins do not have alpha-helix in their transmembrane portion?

Which of the following proteins do not have alpha-helix in their transmembrane portion? Correct Answer Porins

Porins do not have alpha-helix in their transmembrane portion. They contain beta-barrels in their transmembrane portion. Beta-barrels are made up of anti-parallel beta-sheets. Rhodopsin, GPCRs, and glycophorins have alpha-helix in their transmembrane portion.

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