| http://www.w3.org/ns/prov#value | - The shelf-life of immunogen formulation can also be extended by using substances with only a small number of double bonds, that is, by a low degree of unsaturation, by the addition of antioxidants, chelators, and other stabilizing agents, or by preparing the immuno-penetrants ad hoc or in situ from a freeze dried or a dry mixture.
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