According to the present disclosure, there is provided a method for culturing factor-introduced cells, the method including culturing factor-introduced cells and recovering the factor-introduced cells and seeding at least part of the recovered cells in a medium for seeding. In addition, there is provided a method for culturing factor-introduced cells, the method including culturing factor-introduced cells and inducing the factor-introduced cells to somatic cells different from pluripotent stem cells without passaging.

A genome-replication-deficient and transcription/competent negative/strand RNA virus, which can be used for the expression of transgenes and in particular for the area of vaccine development. In particular, a recombinant Sendia virus containing a viral genome with a mutation in the gene P, which leads to loss of capacity for replication without loss of capacity for secondary transcription, and at least one sequence coding for a heterologous gene product. Furthermore, a nucleocapsid of the Sendai virus, a genome of the Sendai virus, a DNA molecule that codes for the genome and/or antigenome of the Sendai virus. One aspect is a pharmaceutical composition containing the Sendai virus, the nucleocapsid, or the viral genome as active substance, and a medical use thereof, especially as a vaccine.

The present disclosure provides a production method for artificial pluripotent stem cells, the method comprising preparing somatic cells, and introducing a Sendai virus including reprogramming factor RNA into the somatic cell. The present disclosure also provides a production method for artificial pluripotent stem cells, the method comprising preparing somatic cells, introducing reprogramming factor RNA into the somatic cells using an RNA transfection reagent, and reprogramming the somatic cells in a gel culture medium.

The present invention relates to a genome-replication-deficient and transcription-competent negative-strand RNA virus, which can be used for the expression of transgenes and in particular for the area of vaccine development.

The present invention relates to a method of manufacturing an alveolar organoid using alveolar cell-derived induced pluripotent stem cells. The alveolar organoid manufactured according to the present invention is differentiated from the human alveolar cell-derived induced pluripotent stem cells, and thus induced pluripotent stem cells may efficiently differentiate into alveolar organoids due to the epigenetic memory of alveolar cells. Therefore, the alveolar organoids are expected to be effectively used for research on the pathological process of respiratory diseases, screening for finding therapeutic drugs, and the like.