Table 1.
The number of chimeric conceptuses recovered from each chimera series analysed (see text for details of mouse strains).
| Number (%) of conceptuses | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Series | Age | Embryo 1 (GPI1-A)↔Embryo 2 (GPI1-B) (female×male)↔(female×male) | Implantations | Empty | Non-chimerica | Unclassified | 2n↔2n | 3n↔2n | Ts3↔2n |
| 3n↔2n chimeras | |||||||||
| TrA | E12.5 | PO2×(BALB/c×A/J)F1↔NIH×NIH | 34 | 0 | 6 (17.6b) | 1c | 25 (92.6d) | 2 (7.4d) | – |
| TrB | E9.5 | TRIP×(BALB/c×A/J)F1↔NIH×NIH | 8 | 1 (12.5) | 1 (8.0) | 0 | 4 (66.7) | 2 (33.3) | – |
| TrC | E9.5 | TRIP×(BALB/c×A/J)F1↔FVB×FVB | 38 | 6 (15.8) | 16 (50.0) | 0 | 9 (56.3) | 7 (43.8) | – |
| Ts3↔2n chimeras | |||||||||
| TS | E9.5 | (BALB/c×A/J)F1×(TGA×RBT)↔FVB×FVB | 51 | 8 (15.7) | 9 (20.9) | 0 | 32 (94.1) | – | 2 (5.9) |
a
All non-chimeric conceptuses in all four groups were derived from diploid embryo 2 (NIH or FVB).
b
Percentage of all conceptuses.
c
Conceptus TrA-6 was chimeric in only the yolk sac mesoderm and was not classified as 2n↔2n or 3n↔2n.
d
Percentage of chimeric conceptuses (excluding unclassified conceptuses).