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?
This helix is also . Where does the hydrophobic point?