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Control: 2-HPNT (2-Hydroxy-p-Nathoqinone-Tech.); H1-H4: Henna samples obtained from Jalan Bani Bu Ali, Sur, Badyia and Ibra, respectively. The samples H1-H4 were tested at 50% concentration. Zones of inhibition were measured in millimetres (mm) diameter and the average of three experiments was shown.
