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9 Although ALA audience: medical/academic researchers is considered the essential omega-3 fatty acid because it cannot be synthesized by humans, evidence that human conversion of EPA and, particularly, DHA is relatively inefficient suggests that EPA and audience: medical/academic researchers DHA may also be essential under some conditions.10, 11 Biological Activities Membrane Structure and Function Omega-6 and omega-3 PUFA are important structural components of cell membranes. When incorporated audience: medical/academic researchers into phospholipids, they affect cell membrane properties such as fluidity, flexibility, permeability and the activity of membrane bound enzymes.12 DHA is selectively incorporated into retinal cell membranes and postsynaptic neuronal cell membranes, suggesting it plays important roles in vision and nervous system function. Vision DHA is found in very high concentrations in the cell membranes of the retina, which conserves and recycles DHA even when omega-3 fatty acid intake is low.13
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