vitamin A2

vitamin A2

an alternative form of vitamin A found in the tissues of freshwater fish but not in mammals or saltwater fish. Differences in ultraviolet light absorption spectra are used to distinguish the vitamin A forms.

vi·ta·min A₂

(vī'tă-min)

Fat-soluble vitamin occurring chiefly in the livers of freshwater fish and having about 40% of the biologic activity of vitamin A₁.
See also: leukoplakia

vitamin A₂

A compound found in the livers of freshwater fish; similar in properties to vitamin A but with different ultraviolet absorption spectra.

de·hy·dro·ret·i·nol

(dē-hīdrō-reti-nol)

Retinol with an additional double bond in the 3-4 position of the cyclohexane ring.
Synonym(s): vitamin A2.