The results of a joint research with Profs. Kurumozaka and Kujirai of the Institute for Quantitative Biosciences, the University of Tokyo and others have been published in the international journal Nature Communications. This paper presents a groundbreaking study in which RNA polymerase II complexes isolated by immunoprecipitation from a human cultured cell line were directly analyzed by cryo-electron microscopy, revealing multiple structures including transcription elongation factors and nucleosomes.