Fig. 5. HLEA and HLEB are both required for robust hindlimb expression of
Tbx4. (A) Schematic of mouse Tbx4 genomic region.
BAC transgene RP24-84E15 and derivatives are represented by gray bars. Yellow
ovals, HLEA; green circles, lung enhancer; gray circles, umbilical cord
element; pink ovals, HLEB; blue box, IRES-βGeo. (B-I) Lateral
(B,D,F,H) and ventral-posterior (C,E,G,I) views of whole-mount lacZ
staining of E12.5 transgenic mouse embryos carrying BAC transgenes RP24-84E15
(B,C),
HLEA (D,E),
HLEB (F,G) or
HLEA
HLEB
(H,I).