Loose connective tissue, a. Photomicrograph of a mesentery spread stained with Verhoeff s hematoxylin to show nuclei and elastic fibers, counterstained with safranin for identification of mast cell granules and with orange G for identification of other proteins (mainly collagen fibers). The elastic fibers appear as blue-black, thin, long, and branching threads without discernable beginnings or endings. Collagen fibers appear as orange-stained, long, straight profiles and are considerably thicker than the elastic fibers. Most of the visible nuclei

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