A blood clot formed in vitro...

A colorized scanning electron micrograph of a blood clot formed in vitro. The green strands are fibrin, the purple clusters are adherent platelets, and the red objects are trapped red blood cells.

Cover image, Nature, October 4, 2001. Image by Yuri Veklich and John W. Weisel, University of Pennsylvania. See also Levy, G.G., Nichols, W.C., Lian, E.C., Foroud, T., McClintick, J.N., McGee, B.M., Yang, A.Y., Siemieniak, D.R., Stark, K.R., Gruppo, R., Sarode, R., Shurin, S.B., Chandrasekaran, V., Stabler, S.P., Sabio, H., Bouhassira, E.E., Upshaw, J.D., Jr., Ginsburg, D., and Tsai, H.M. 2001. Nature 413:488–494.