Cell-cell connectivity network showing that cell-type–based sorting happens during the emrbyoid development. Credit: Science Advances (2025). DOI: 10.1126/sciadv.adr8901 Scientists have sought to capture the first days of how a person comes to be, by recreating those early moments in a lab via models made up of induced pluripotent stem cells, or IPSCs. Induced pluripotent stem cells are cells that are modified to have the ability to become any cell in the