Effects of anastellin and endostatin on endothelial cell proliferation. Microvessel cells were seeded (500 cells/well) in the presence of complete medium (day 1). After 4 hours, anastellin or endostatin was added to the medium. At day 4 and ay 6, the number of cells was determined by ELISA. Control wells (C) received no peptide. All wells were normalized to the 6-day control which was set at 1. Error bars represent standard error of the mean of triplicate samples.