In Xenopus as in mouse, FGFRL1 expression starts at the gastrula stage, whereas neither of the zebrafish duplicates is expressed before somitogenesis.
The results that were analyzed by ANOVA, show that VEGF expression starts to increase 26 h after PH with a peak at 28 h.
Under SD conditions, wild-type Hd1 expression starts to increase at the beginning of the dark period, thus keeping Hd1 as an activator.
Pou4f3 expression starts shortly after the hair cell fate is committed [54].
In addition, Prox1 expression starts in the spiral ganglia around that time (Fig. 1C, insert).
Dll1 expression starts during the mid-streak stage in embryonic mesoderm.
In hind legs, expression starts at the limb bud stage (Fig. 4C).
We thus conclude that dbx1 expression starts concomitantly to the formation of the first somites and is highly dynamic.
This result is interesting and unexpected as shh expression starts in the retina at 28 hpf [49].
TrkC and Obelix belong to the streak group, as their expression starts at the mid-/late primitive streak stage.
Expression starts in mid-embryonic stages in 200-300 cells of the CNS and in several endocrine cells.
