| http://www.w3.org/ns/prov#value | - These components can be removed by adjusting pH of the polypeptide composition without or with addition of 1 to 6% of one or more hydroxides or salts of alkaline earth metal, for example, calcium salts such as calcium hydroxide, calcium chloride, calcium lactate, calcium sulfate, calcium glycerophosphate, calcium citrate, calcium gluconate and calcium phosphate based on the solids content of the p
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