Delta-4 desaturase catalyzes the creation of a double bond at the
fourth position from the carboxyl end of docosapentaenoic acid
(C22:5), converting it into docosahexaenoic acid (C22:6). It was
also found that the another substrate for Δ4-desaturase, 22:4ω6,
can be parallely desaturated to 22:5ω6.
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