What does it take to make a worm?

MicroRNAs are important regulators of development, but exactly what different miRNAs do and at which embryonic stages has yet to be determined. Scientists at the Research Institute of Molecular Pathology (IMP) in Vienna have now shown that just two microRNAs are essential for embryogenesis in the worm C. elegans. Their system provides a blueprint for further studies in this dynamic research field.