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Fig. 2. ß-galactosidase expression in Pax3 transgenic mice. (A) The
6.1 kb upstream region of the proximal Pax3 genomic sequence
(construct 1) partially recapitulates Pax3 expression in the
hindbrain (hb), the dorsal root ganglia (drg), and the neural tube (nt). (B)
Transgenic expression from the 1.6 kb upstream region and intron 1 (construct
2) yields a similar expression pattern to the 6.1 kb construct. (C) Deletion
of 5' upstream region (construct 4) maintains the neural crest
expression pattern. (D) Deletion of sequences 5' and 3' to NCE1
and NCE2 as well as the 156 bp internal region (resulting in construct 9)
maintains the expression pattern seen in A, although hindbrain and neural tube
expression is somewhat weaker.