NEUROG1 and breast cancer: Since Neurog1 is known to be required for the formation of both cochlear and vestibular neurons [27], these results indicate that the integration pattern of cells derived from the wild type donor cells recapitulates that expected from cells with wild type endogenous Neurog1 gene function and that Neurog1 haplodeficiency creates a vacant niche that can be filled by cells derived from exogenous stem cells to produce SGNs using BC.