* [http://loci.wisc.edu/software/sample-data Sample data at LOCI], in a variety of file formats.
ome-xml.org/ wiki/ OmeTiffData Sample OME-TIFF data on ome-xml.org], thanks to Josh Bembenek.[[File:tubhiswt4D.png|right|140px|''C. elegans'' embryo coexpressing tubulin histone GFP]]
:The dataset consists of tubulin histone GFP coexpressing ''C. elegans'' embryos. All image planes were collected at 512x512 resolution in 8-bit grayscale.
pacific. mpi-cbg.de/datasets/migrating-macrophages.tif.tar.bz2 Migrating macrophages] in response to stimuli.
:4D data set, kindly provided by Dirk Sieger and [http://www.embl.de/research/units/dev_biology/peri/ Francesca Peri], EMBL.[[File:Migrating-macrophages.gif|right|140px|Macrophages in 4D]]
:'''The challenge''': trace the macrophages in 4D, and measure their shape volumes, surfaces, positions and pixel value intensities.