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Organs come in many different forms. The stomach, with its composition of epithelium , connective tissue , nervous tissue, and smooth muscle tissue, is a familiar example. Bones are organs; although they consist primarily of osseous tissue, bones have a vast supply of nervous tissue in their nerves, fibrous tissue lining their cavities, and muscle and epithelial tissue in their blood vessels. The skin (integument) is an organ consisting of an epithelium (epidermis) overlying a thick layer of connective tissue (dermis) rich with blood vessels and accessory structures such as secretory glands.
The Rome lab at UCLA has collaborated with a number of groups to use the baculovirus system to produce large quantities of vaults. When the major vault protein (MVP) is expressed in insect cells, vault particles are assembled on polyribosomes in the cytoplasm.  By using molecular genetic techniques to modify the gene encoding the major vault protein, vault particles have been produced with chemically active peptides attached to their sequence. These modified proteins are incorporated into the inside of the vault particle without altering its basic structure. Proteins and peptides can also be packaged into vaults by attachment of a packaging domain derived from the VPARP protein.  A number of modified vault particles have been produced in order to test the concept that vaults can be bio-engineered to allow their use in a wide variety of biological applications including drug delivery , biological sensors, enzyme delivery, controlled release , and environmental remediation .