Provided are methods for producing a reprogrammed fibroblast or epithelial cell. The methods include growing a plurality of fibroblasts or epithelial cells in monolayer culture to confluency and disrupting the monolayer culture to place at least a fraction of the plurality of fibroblasts or epithelial cells into suspension culture under conditions sufficient to form one or more embryoid body-like spheres, wherein the one or more embryoid body-like spheres comprise one or more reprogrammed fibroblasts or epithelial cells that express one or more markers not expressed prior to the disrupting step. Also provided are reprogrammed fibroblasts or epithelial cells produced by the disclosed methods, formulations that include reprogrammed fibroblasts or epithelial cells, methods for using the reprogrammed fibroblasts or epithelial cells, methods for producing chimeric non-human mammals that include one or more sphere-induced Pluripotent Cells (siPS), and chimeric non-human mammals produced thereby.
