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The transcription factors, GATA-1, -2 and -3 play essential roles in the differentiation of haematopoietic cells. To study the process of blood formation during vertebrate development we have used the expression of these GATA factors to locate haematopoietic cells inXenopus embryos and to act as sensors for the effects of all-trans retinoic acid (RA), a signalling molecule which influences both anteroposterior...
The first haematopoietic stem cells in mammalian and non-mammalian vertebrates are derived from mesoderm, therefore genes that are important in mesoderm patterning and formation might also play an essential role in haematopoietic stem cell commitment and differentiation. Several members of the Wnt gene family are expressed in very specific patterns in embryonic mesoderm and have previously been shown...
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