| http://www.w3.org/ns/prov#value | - The supernatant containing the desired receptor compound is then purified in accordance with the novel purification method of this invention by interaction with insolubilized substrates of the following formula: where R is a substrate group as defined above, and M is an insoluble matrix, i.e., any insoluble material capable of covalent bonding with said substrate and which does not interfere with
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