Neutrophils, a type of white blood cell are seen here moving around the body of a zebrafish embryo in search of debris and foreign bodies to clean up. The cells have been labelled with labelled with a Green Fluorescent Protein, so that we can be seen clearly.
Filmed at the MRC - Centre for Developmental and Biomedical Genetics, Sheffield. For more info see www.fishforscience.com
![](https://i.ytimg.com/vi/31o-xjUfIEY/mqdefault.jpg)