29.aNterior development uses localized gene regulators Donor wild-type embryo Figure 29.6 Mutant embryos that cannot develop can be rescued by injecting cytoplasm taken from a wild-type embryo. The donor can be tested for time of appearance and Remove material from donor location of the rescuing activity the and microinject into recipient recipient can be tested for time at which it is susceptible to rescue and the effects of injecting material at Recipient different locations Mutant embryo 消当Figure 29.6 Mutant embryos that cannot develop can be rescued by injecting cytoplasm taken from a wild-type embryo. The donor can be tested for time of appearance and location of the rescuing activity; the recipient can be tested for time at which it is susceptible to rescue and the effects of injecting material at different locations. 29.5 Anterior development uses localized gene regulators