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The essential oils isolated from roots of two Achillea millefolium populations (BGL and CGA) and from two hairy root cultures (A4 and LBA) derived from one of these were analysed by GC and GC-mass spectrometry. The essential oils from the plant roots were obtained in a yield of 0.10% (BGL) and 0.05% (CGA) (v/w), whereas that of both hairy root cultures attained 0.05% (v/w). Compared on a dry weight...