Fig. 5. (A) Hox/PBC-binding sites in the egl-18 and elt-6 genomic region and GFP reporter constructs. Open reading frames of egl-18 and elt-6 are indicated by black and gray boxes, respectively. Introns and 5' and 3' UTRs are indicated by lines. Triangles indicate consensus Hox/PBC-binding sites, two of which in the second intron of egl-18 are labeled sites 1 and 2. (B) Alignment of C. elegans site 1 and the corresponding C. briggsae sequence. The region corresponding to C. elegans site 2 is not conserved in C. briggsae.