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MATHEWS MM. PROTECTIVE EFFECT OF BETA-CAROTENE LETHAL PHOTOSENSITIZATION BY HAEMATOPORPHYRIN. Nature. 1964 Sep 5;203:1092–1092.[PubMed]
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Pathak MA, Fitzpatrick TB, Frenk E. Evaluation of topical agents that prevent sunburn--superiority of para-aminobenzoic acid and its ester in ethyl alcohol. N Engl J Med. 1969 Jun 26;280(26):1459–1463.[PubMed]
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