The large (1mm diameter), easily accessible eggs of the frog Xenopus laevis (100-1000 eggs at once per frog) offer the opportunity to reconstitute cell cycle events in-vitro by generating cell-free extracts which retain all the biochemical components that regulate cell cycle progression, as well as

This assay evaluates the sprouting ability of endothelial cells in a collagen matrix and it used as an in vitro model to study the formation of new blood/lymphatic vessels. The effect of pro-angiogenic growth factors or co-cultured cells can be measured by quantifying the amount of vascular sprouts