Abstract
Summary Cell suspension cultures derived from Papaver bracteatum Lindl var. Arya II P. somniferum L. var. Halle and var. Berlin, P. setigerum D. C., and P. nudicaule L. were found to contain protopine, sanguinarine, isothebaine and orientalidine. Growth of P. bracteatum suspensions at 36°C followed by 5°C caused release of thebaine into the media.
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