Fig. 3. (A) Crossing strategy and phenotype of the different Gata1 mutant foetuses obtained at 13.5 dpc. A photograph of the foetus and foetal liver is included for each genotype. Mice a and d are wild type or Gata1-overexpressing, respectively, regardless of expression of the pEV-Cre transgene (in brackets). a-f are as in Fig. 1A, Fig. 4C and Fig. 5A. (B) Total cell number in foetal blood at 14.0 dpc. Average and s.d. are indicated. At least three foetuses were analysed per group.