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Its specific role, however, is not well understood. The echinacea role of DHA may be related to its biophysical effects on the cell membrane. DHA influences the biophysical properties of membranes via its high polyunsaturation, and may help to create a membrane that accommodates the dynamic behavior of rhodopsin during the photoreceptive process.3-5 In addition, DHA may echinacea modulate the activity of membrane bound enzymes and receptors, and the kinetics of membrane transport systems, as well as being a precursor for the synthesis of other biologically active molecules. A number of studies in echinacea preterm and term human infants have suggested that a dietary supply of omega-3 fatty acids may be essential for optimal visual development.6-8 Finally, animal data suggest that retinal degeneration in rats might be prevented by dietary intake of DHA,9 and DHA administered before ischemia may reduce pressure-induced retinal damage in monkeys.10
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