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165, 176], 'sesquiterpene': [14, 20, 74, 114], 'lactones.': [15], 'Parthenolide': [16], 'the': [18, 40, 43, 58, 77, 81, 84, 94, 132, 148, 154, 173, 183], 'main': [19], 'lactone': [21], 'in': [22, 46, 88, 118, 128, 137, 146, 153, 167], 'feverfew': [23, 53], 'has': [25], 'attracted': [26], 'attention': [27], 'because': [28], 'its': [30], 'potential': [32], 'for': [33], 'treatment': [34], 'migraine': [36], 'cancer.': [38], 'In': [39], 'present': [41], 'work': [42], 'parthenolide': [44, 63, 89, 144, 187], 'content': [45], 'different': [47, 119], 'tissues': [48, 120, 138, 185], 'developmental': [50], 'stages': [51, 158], 'was': [54, 69, 126, 135, 151], 'analyzed': [55, 117], 'to': [56, 72, 79, 93], 'study': [57], 'timing': [59], 'localization': [61], 'biosynthesis.': [64, 90], 'The': [65, 162], 'strongest': [66], 'accumulating': [67], 'tissue': [68], 'subsequently': [70], 'used': [71], 'isolate': [73, 80], 'synthases': [75, 115], 'with': [76], 'goal': [78], 'gene': [82], 'encoding': [83], 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