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Fig. 4. (A) CASY analysis: the ratio of definitive versus primitive erythrocytes in
foetal blood was compared at 13.5 and 14.0 dpc. The percentage of definitive
cells in blood in each genotype at 13.5 dpc and 14.0 dpc is depicted below the
graph. Average and s.d. are indicated. At least three foetuses were analysed
per group. (B) CASY analysis: example of CASY graphs from wild-type male and
compound female at 13.5 dpc. Peaks corresponding to enucleated and nucleated
cells are indicated. The peak below 5 µm corresponds to cell debris. (C)
Blood cytospins of each genotype at 13.5 dpc showing primitive nucleated
erythrocyte (1), definitive enucleated erythrocyte (2), erythroid precursor
(arrowhead). Pictures were taken at 100x magnification.