Zebrafish embryos are transparent and develop outside the mother’s body, enabling scientists to get a detailed view of early development. A research team led by Lila Solnica-Krezel, the Alan A. and Edith L. Wolff Distinguished Professor and head of the Department of Developmental Biology at Washington University School of Medicine in St. Louis, is revealing new clues to how birth defects develop in the tiniest embryos. Solnica-Krezel explained her lab’s recent work, published in the journal Developmental Cell.