Figure 1. A range of transgenic lines with elevated spatiotemporally accurate DeltaD expression.

(a–f) deltaD-venus recapitulates WT deltaD expression pattern. Whole-mount ISH, 9 somite-stage embryos lateral view with either deltaD or egfp anti-sense riboprobe in deltaD mutant after eight (aei)^+/− (a), WT AB (b) or deltaD-venus transgenic lines (d–f). (c) Schematic representation of deltaD-venus construct for generating transgenic lines. See Supplementary Fig. 1. (a) Scale bar, 300 μm. (f–h) deltaD transgenic copy numbers determined by quantitative real-time PCR from genomic DNA. Copy number is insensitive to aei point mutation allele (g). Transgenic copies (h,i) are total deltaD copies minus 2 endogenous copies. Empty bars, heterozygous genotypes; black bars, homozygous genotypes. Data pooled from ⩾3 independent experiments, mean±s.d. (j) DeltaD protein expression visualized and quantitated by immunostaining. (ja–jc) PSM of flat-mounted 9 somite-stage embryos, circle shows region used for intensity measurement. Scale bar, 50 μm. (k) DeltaD protein expression levels versus deltaD gene copy number. Expression level in aei^−/− was defined as 0. Grey dashed line, linear fit as the formula and R² value at upper left corner. Inset shows magnification of data points at origin. Mean±s.d. (n⩾5).