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Fig. 2. Recombination of the Gata1 floxed locus. (A) Maps of the floxed
and the knockout Gata1 locus after recombination. N, NcoI;
B, BamHI, X, XbaI; En2, murine engrailed 2 intronic
sequence; SA, splice acceptor; GFP, green fluorescence
protein. LoxP sites are indicated. (B) DNA samples of 13.5 dpc
foetuses were digested with NcoI and blotted against the En2
probe for quantifying recombination of the Gata1 floxed locus. 1, XY
wild-type male head DNA control; 2, XFLX female head DNA control;
3, XKOX female foetal liver DNA.