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Diethylaminoethyl (DEAE) Anion exchange chromatography of a 6 M urea extract of ovine articular cartilage showing protein (A280 nm), sulfated glycosaminoglycan (A535 nm), and relative trypsin inhibitory activity of the fractions (A405 nm). The column was eluted with a gradient of NaCl (dotted line). Fractions displaying serine proteinase inhibitor (SPI) activity were pooled as shown for further purification.
