| http://www.w3.org/ns/prov#value | - Oral delivery to the circulatory system for many biologically active agents would be the route of choice for administration to animals if not for physical barriers such as the skin, lipid bi-layers, 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 sys
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