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Fig. 7. Tetraploid cells can rescue abnormal morphologies of NT embryos at
E7. (A,B) Normal chimaeras made by aggregation of a NT
embryo and a tetraploid, GFP-expressing, embryo developed from a fertilised
zygote. (C) Tetraploid embryo developed after disappearance of NT
blastomeres. The embryo in A is at early streak stage; the embryo in B is at
late-streak stage. (Inset) Higher magnification of C showing that all epiblast
cells express GFP. Scale bars: 100 µm.