Fig. 2. VM-PS subdivision by metameric gene expression. Lateral views of wild-type whole embryos (A-D) and enlarged VM-PSs at late stage 11 to early stage 12 (E-H) stained as indicated. (A) bnl. (B)TIN. (C) bap-lacZ. (D) CON. (E-H) Vertical broken lines indicate gene expression boundaries. Interpretation of each picture is shown below. E3-H3 are merges of E1-H1 and E2-H2. (E) CON and VM-hh-lacZ are colored in red and green, respectively. (F-H) TIN is colored in red. bap-lacZ (F), bnl RNA (G) and VM-hh-lacZ (H) are colored in green. (I) Model of VM-PS subdivision. Asterisks indicate regions present in abdominal VM-PSs but absent from thoracic VM-PSs (VM-PS3-5). a and p, respectively, indicate a and p regions that form the tin/bnl/bap domain at the VM-PS border.