Fig. 2 β4GalT1 is expressed throughout the first 24 h of embryonic development. (A) Semi-quantitative RT-PCR for β4GalT1 in staged RNA libraries; oocyte, 50% epiboly, 12-somite and Prim-16. Expression is first detected in the oocyte and remains relatively constant in all stages assayed. Error bars = ±SEM. (B, C) In situ hybridizations for β4GalT1. (B) Two-somite stage, lateral and dorsal views, display β4GalT1 expression throughout the embryo. The increased signal in the midline (arrow) is most likely due to increased tissue mass. (C) 26-somite stage embryos; lateral, dorsal at the midbrain level, and nasal views are shown, demonstrating tissue-specific increases in expression. β4GalT1 expression in the lateral mesoderm ends abruptly at the midbrain level (asterisks) and shows high expression in the developing retina (arrowhead) and nasal placode (arrow).
Reprinted from Developmental Biology, 297(2), Machingo, Q.J., Fritz, A., and Shur, B.D., A beta1,4-galactosyltransferase is required for convergent extension movements in zebrafish, 471-482, Copyright (2006) with permission from Elsevier. Full text @ Dev. Biol.