Microinjection of Embryos.

Microinjection is an important technique used to study development in the oocyte and early embryo. In , substances such as DNA, mRNA, and morpholino oligonucleotides have traditionally been injected into , because of their large embryo size and the relatively long time from their fertilization to first division. In the past few decades, has become an important model in developmental biology; it is particularly useful in genetic studies. The advent and rapid development of CRISPR-Cas9 technology has provided an array of targeted gene manipulations for which is particularly suited. The equipment and protocol for microinjection is broadly transferable from There are important differences between the species to consider, however, including the smaller embryo size and faster embryo development time in There are a number of solutions and reagents that differ in concentration and composition as well. Here we describe a microinjection protocol specifically for studies in .