 If cells of a particular line have been removed from the embryo and are growing alone in a Petri dish in the lab, and some cell signaling chemicals are put in the growth medium bathing the cells, this can induce the cells to differentiate into a different, “daughter” cell type, mimicking the differentiation process that occurs naturally in the developing embryo.Artificially inducing differentiation in this way can yield clues to the correct placement of a particular cell line in the embryogenic tree, by observing what kind of cell results from inducing the differentiation.In the laboratory, human embryonic stem cells growing in culture can be induced to differentiate into progenitor cells by exposing the hESCs to chemicals (e.g.