Developmental Cell Levin/Yanai Video Abstract

Developmental milestones punctuate gene expression in the Caenorhabditis embryo. A fundamental question in developmental biology relates to the connection between morphological stages and their underlying molecular activity. Here we demonstrate that, at the molecular level, embryonic development in five Caenorhabditis species proceeds through two distinct milestones in which the transcriptome is resistant to differences in species-specific developmental timings. By comparing the complete.