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A Desaturase is an enzyme which removes two hydrogen atoms from an organic compound, creating a carbon/carbon double bond.

In the biosynthesis of essential fatty acids, an elongase alternates with different desaturases (Δ6desaturase, Δ5desaturase, Δ4desaturase) repeatedly inserting an ethyl group, then forming a double bond.

See also

de:Desaturasen nl:Desaturase