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Aren't the many chromatographies out there sufficient? Or ultrafiltration? Can you be a bit more specific about your needs? JPK -----Original Message----- From: CCP4 bulletin board [mailto:[log in to unmask]] On Behalf Of Reza Khayat Sent: Tuesday, August 19, 2014 9:55 AM To: [log in to unmask] Subject: [ccp4bb] Removing PEG3350 Hi, Does anyone have a protocol for getting rid of PEG3350 from a protein sample? Best wishes, Reza Reza Khayat, PhD Assistant Professor The City College of New York Department of Chemistry, MR-1135 160 Convent Avenue New York, NY 10031 Tel. (212) 650-6070 www.khayatlab.org