| http://www.w3.org/ns/prov#value | - Methods of making such constructs, introducing the vector into the cells and expression are known in the art. [0254] In another aspect of the present invention, particles such as cells can co-express two proteins, one the exogenous cell surface marker or over-expressed endogenous cell surface marker discussed above and the second an exogenous ion transport protein or over-expressed endogenous ion
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