02 Jul 2011 --- deposition, full frame, backgrounds is the substance or matter of a tissue which is not a cell. Typically it is composed of protein polymers enriched with sugary branches. Shown here are fibronectin fibers. It is also known for sequestering or storing and then liberating or activating growth factors and matrix proteases, thus directly affecting cell behavior. The confocal image indicates chronological matrix deposition represented by the different colors. X63 --- Image by © Dr. Edna Cukierman/Visuals Unlimited/Corbis
23 Oct 2005, Grand Canyon, Arizona, USA --- Fossil worm burrows in the Grand Canyon, somewhere between mile 220-260 miles below Lee's Ferry. The traces are identical to those found atop the White Mountains in California, many mountain ranges and hundreds of miles away. Probably of Cambrian Tonto a --- Image by © William James Warren/Science Faction/Corbis