Assertion: botulinum toxin's use | /r/CapableOf | purify botulinum toxin
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text: Moreover, US Patent No. 6818409 discloses the use of ion exchange and lactose columns to purify a botulinum toxin, and US Patent No. 7452697 discloses a botulinum type A toxin by ion exchange chromatography and hydrophobic chro-matography.