| http://www.w3.org/ns/prov#value | - SUMMARY OF INVENTION The present invention relates to the deproteinization of biological fluids by removing the water insoluble phase after adding to the fluid a water insoluble crosslinked polycarbonic acid obtained by crosslinking a polymer of the formula ##STR1## wherein R is hydrogen or lower alkoxy and n is a whole number of 100-10,000,with a diamine and hydrolysing unreacted anhydride groups
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