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Phytyl tail

Side chain of vitamins E and K.

Isoprenoid-derived lipid tail that anchors fat-soluble vitamins E (tocopherols) and K (phylloquinone, menaquinones) in membranes.

How one textbook covers it

Advanced Nutrition and Human Metabolism, 8th ed. (Gropper) — Glossary
Isoprenoid-derived lipid tail that anchors fat-soluble vitamins E (tocopherols) and K (phylloquinone, menaquinones) in membranes.

Isoprenoid