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Fig. 2. The onset of Gata2 expression in sympathetic ganglia in relation
to the expression of Phox2b, Hand2, Phox2a and Th. Frozen
sections from the brachial region of stage 18/19 chick embryos, staged
according to the number of somites, were analysed for the expression of
Phox2b, Hand2, Phox2a, Gata2 and Th. Gata2 expression was
first observed in 34-somite embryos, after the onset of expression of
Phox2b, Hand2 and Phox2a, but before Th, which was
first observed in 35-somite embryos. Black and white arrowheads indicate the
presence or absence, respectively, of gene expression in primary sympathetic
ganglia. Gata2 expression was additionally detected in the ventral
part of the dorsal aorta (da) (I) and in the spinal cord (D,I,N). The results
are summarised in Table 1.
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