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And a recent study found that a lotion containing 10% citronella oil -- a popular ingredient in natural candles and spray-on repellents --provided about 30 minutes of protection, though it was generally less effective than DEET

Nicotinic Receptor Activation Negatively Modulates Pro-Inflammatory Cytokine Production in Multiple Sclerosis Patients

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Dimensions: 3408 x 6344 px | 28.9 x 53.7 cm | 11.4 x 21.1 inches | 300dpi More information: This image could have imperfections as its either historical or reportage.