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Platycodon grandiflorum hairy roots, induced by the infection with Agrobacterium rhizogenes MAFF03-01724, produced three polyacetylenes, lobetyol (1), lobetyolin (2) and lobetyolinin (3) (maximum content; 1:0.21% 2:0.41%, 3:0.02 % as dry weight), whose contents were higher than those of the roots of the intact plant (2:0.019 % as dry weight, 1 and 3 were not detected). These polyacetylenes, widely...