The development of 12th to 14th day foetuses following reimplantation of pre- and early-primitive-streak-stage mouse embryos.

This paper describes a technique for transplanting early postimplantation mouse embryos from their own implantation site to a decidua in another pregnant mouse. Evidence is provided that this procedure is compatible with their continued development. At a low frequency both 6th and 7th day embryos can re-establish themselves and continue apparently normal development and placentation for at least 6-8 days.