Nucleotide sequence of the LU 5′ flanking region showing the putative regulatory cis-acting elements. +1 refers to the transcription initiation site. The first 40 nucleotides of exon 1 are in upper case and the initiation codon ATG is underlined. The boxes correspond to putative cis-acting regulatory elements (Sp1, EGR-1, AP2, GATA, CACCC, and Ets). Mismatches with consensus motifs are indicated by asterisks.