The mirror image of an orange limonene molecule has the exact same chemical composition, but smells of lemon.

A chiral molecule twists in one direction or another, like the thread of a screw.

Most biomolecules in nature are chiral (sugars, DNA, proteins, amino acids, steroids).

Human proteins are exclusively built from L-amino acids which implies that all receptors are chiral.

That is why mirror image molecules can have radically different activities in the body.

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