| http://www.w3.org/ns/prov#value | - In some embodiments, the present invention provides methods for determining the purity of a particle, wherein said particle is a lipoparticle, virus, or virus-like particle preparation comprising: a) quantifying number of particles in said preparation; b) quantifying total protein concentration in said preparation; and c) determining said purity by dividing the total protein concentration by the n
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