Seung-Won Lee, Byeong-Kwon Sohn, Urmimala Basu, Hayoon Cho, Jiayu Shen, Aishwarya Deshpande, Smita S. Patel, Hajin Kim “Conformational Dynamics During Initiation-Elongation Transition in Yeast and Human Mitochondrial Transcription by Single Molecule FRET Measurements”