Fig. 5. The conserved topology of Ubx binding sites 5 and 6 and the M1 site in
the sal1.1 CRE. Alignment of a deeply conserved block of 37
nucleotides (shaded blue, indicating 100% nucleotide conservation) containing
Ubx binding sites 5 and 6 and the collaborating M1 site in the sal1.1
CRE from four species of Drosophila. Nucleotides conserved in three
out of four species are shaded in gray.