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Images of the stems of (A) 4-week-old and (B) 9-week-old S. dulcamara plants. No adventitious root (AR) primordia were present on the stem of the 4-week-old plant, whereas 6 AR primordia (the white spots indicated by the black arrows) can be discerned upon visual inspection on the stem of the 9-week-old plant. Scale bars: (A) = 0·25 cm; (B) = 0·4 cm.
