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Spontaneously regenerating shoots (indicated by arrows) form hairy roots of RgTR17 line during cultivation in the dark on liquid hormone-free DCR medium, 4th week of culture (a); shoots regenerating form explants of RgTR17 hairy root line when grown on solid SH supplemented with 0.5 mg/L BAP and cultivated under a 16/8h (light/dark) photoperiod, 4th week of culture (b).
