| http://www.w3.org/ns/prov#value | - Oral delivery to the circulatory system would be the route of choice for administration of many active agents to animals if not for physical barriers such as the skin, lipid bilayers, and various organ membranes that are relatively impermeable to certain biologically active agents, but which must be traversed before an agent delivered via the oral route can reach the circulatory system.
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