The study describes the use of the piggyBac (PB) transposition system to efficiently reprogram fibroblasts into induced pluripotent stem (iPS) cells. The PB system, which is host-factor independent, allows for the delivery of transcription factors (c-Myc, Klf4, Oct4, and Sox2) via transposon-mediated gene insertion. These factors are expressed in a doxycycline-inducible manner, enabling precise control over reprogramming. The PB system was used to generate iPS cells from both murine and human embryonic fibroblasts, which exhibited characteristics of pluripotent stem cells, including the expression of key pluripotency markers and the ability to differentiate into various cell types. The PB system also enabled the seamless removal of the reprogramming factors, as demonstrated by the excision of transposon insertions and the subsequent loss of the transgenes. This process was achieved through the use of transposase, which catalyzes the excision of the transposon from the genome. The study further demonstrated that the PB system can be used to generate iPS cells without the need for viral vectors, which is a significant advantage over traditional methods that involve retroviral or lentiviral transfection. The PB system was also shown to be effective in generating chimaeras, where iPS cells contributed to the development of embryos and the formation of tissues. The study highlights the potential of the PB system as a powerful tool for reprogramming somatic cells into pluripotent stem cells, with the ability to generate functional adult tissues. The PB system offers several advantages, including the ability to simplify the reprogramming process, reduce the risk of insertion mutagenesis, and enable the precise removal of reprogramming factors. The study also demonstrates the potential of the PB system for high-throughput screening and the exploration of the mechanisms underlying the reprogramming process. Overall, the use of the PB system represents a significant advance in the field of stem cell research, offering a safer and more efficient method for generating iPS cells.The study describes the use of the piggyBac (PB) transposition system to efficiently reprogram fibroblasts into induced pluripotent stem (iPS) cells. The PB system, which is host-factor independent, allows for the delivery of transcription factors (c-Myc, Klf4, Oct4, and Sox2) via transposon-mediated gene insertion. These factors are expressed in a doxycycline-inducible manner, enabling precise control over reprogramming. The PB system was used to generate iPS cells from both murine and human embryonic fibroblasts, which exhibited characteristics of pluripotent stem cells, including the expression of key pluripotency markers and the ability to differentiate into various cell types. The PB system also enabled the seamless removal of the reprogramming factors, as demonstrated by the excision of transposon insertions and the subsequent loss of the transgenes. This process was achieved through the use of transposase, which catalyzes the excision of the transposon from the genome. The study further demonstrated that the PB system can be used to generate iPS cells without the need for viral vectors, which is a significant advantage over traditional methods that involve retroviral or lentiviral transfection. The PB system was also shown to be effective in generating chimaeras, where iPS cells contributed to the development of embryos and the formation of tissues. The study highlights the potential of the PB system as a powerful tool for reprogramming somatic cells into pluripotent stem cells, with the ability to generate functional adult tissues. The PB system offers several advantages, including the ability to simplify the reprogramming process, reduce the risk of insertion mutagenesis, and enable the precise removal of reprogramming factors. The study also demonstrates the potential of the PB system for high-throughput screening and the exploration of the mechanisms underlying the reprogramming process. Overall, the use of the PB system represents a significant advance in the field of stem cell research, offering a safer and more efficient method for generating iPS cells.