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Effects of the extracts of Clausena excavata (essential oil, -○-; methanol extract, -●-), Clausena harmandiana (essential oil, -□-; methanol extract, -■-) and Murraya koenigii (essential oil, -△-; methanol extract, -▲-) against human lung cancer cells (A549) at 24 h (A) and 48 h (B).
