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. Author manuscript; available in PMC: 2010 Sep 1.
Published in final edited form as: Mol Pharm. 2009 Sep–Oct;6(5):1290–1306. doi: 10.1021/mp900018v

Figure 1.

Figure 1

The quadrupole electromagnet of the field-flow fractionation system. The helical channel, held above the magnet in the photograph, is lowered into the quadrupole aperture below for particle analysis.