Six chlorophyll-related compounds isolated from leaves of Neptunia oleracea (Leguminosae) inhibited the activation of tumor promoter-induced Epstein-Barr virus (EBV). Photo-irradiation of pheophorbide a, the major active constituent, did not enhance this inhibitory activity, and thus ruled out any photosensitizing effect playing the major role.
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Nakamura et al. (1996) studied this question.
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