zebrafish hoxb1b for making antisense probe. presumably in pBS. got from Cecilia Moens lab. originally from Vicky Prince lab (Development 128 (2001), 2471. likely cloned into XhoI and XbaI sites. earliest posterior-specific neural (?) marker. from 60% epiboly on in broad posterior domain posterior of r3/r4 (according to Dev Brain Res 148 (2004) 27), till 100% epiboly at least. always non-overlapping with otx-2 or cyp26, which are anterior only. used at late gastrula in Kudoh et al. (2002) Development 129, 4335-4346. for antisense: Asp718, T3