Fig. 4. T-box and Fast binding sites in the derrière promoter. (A) Schematic diagram of the derrière genomic fragment obtained in this work. It comprises 851 base pairs 5' of the first exon, the whole of exon 1 (247 base pairs) and 844 base pairs of the first intron. F1 and F2 represent the putative Fast sites and Tbs1 and Tbs2 the putative T box sites. (B) Partial sequence of the derrière promoter region. The transcription start site is indicated by an arrow and the beginning of the protein coding region is shown in lower case. T box sites Tbs1 and Tbs2 are underlined, as are two matches to the consensus Fast binding site (F1 and F2). (C) Comparison of Tbs1 and Tbs2 with the T box binding site deduced from binding site selection experiments (Kispert and Herrmann, 1993; Conlon et al., 2001).