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Collagen—sources and forms: the principal sources of collagen (bovine tendon, porcine skin, human cadavers, and human recombinant, from top to bottom) are displayed as well as some of the forms (microspheres, gels, sponges, films, and fibers, from top to bottom) into which collagen has been processed for tissue engineering applications. Color images available online at www.liebertpub.com/tea
