Dr. Jun Wu is an Assistant Professor at the University of Texas Southwestern. The Wu lab uses interspecies chimeras to study fundamental biology: conserved and divergent developmental programs, determination of body and organ size, species barriers, and cancer resistance. They are also working to develop new applications for regenerative medicine. He talks about developmental compatibility between species, and the similarities and differences between blastoid models and blastocyts. He also discusses the challenges of growing human cells in animals, and human-monkey chimeric embryos.