1 23 Biotechnology Letters ISSN 0141-5492 Volume 35 Number 6 Biotechnol Lett (2013) 35:961-968 DOI 10.1007/s10529-013-1152-3 Plant regeneration, genetic fidelity, and active ingredient content of encapsulated hairy roots of Picrorhiza kurrooa Royle ex Benth. Janhvi Mishra Rawat, Balwant Rawat & Shakti Mehrotra