| http://www.w3.org/ns/prov#value | - The medium can be essentially free of serum, W. G. Hamilton et al., In Vitro13 537-547 [1977] or plasminogen and other proteolytic enzymes and proenzymes may be removed from the medium or its serum components by passage through a column of lysine-coupled Sepharose in accord with known techniques for fractionating proteins.
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