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Cellular Retinoic Acid Binding Protein

This small protein's job in the cell is to transport the hydrophobic small molecule, retinoic acid, a metabolite important to vision (derived in the cell from vitamin A ).

The protein has a simple , which also serves as a pocket for the () retinoic acid.

This structure has a nice example of a .

The sheet is , with one face hydrophobic and one face hydrophilic. Where does the hydrophobic point?

There is also a simple in this protein.

This helix is also . Where does the hydrophobic point?

Different views of the backbone: