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An investigation of reflectory analgesic reactions was made on the brain of white mice when it was exposed to transcranial laser radiation with the wavelength of 0.89 gin and the energy density of 3. 12 J cm. These reactions were evaluated with the aid of 'tail flick' and 'hot plate' tests. It was found that antinociceptive reactions did not change during the experiment. However, laser radiation might produce a protective antistress effect.

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