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Different properties of ACPA and IgM-RF derived from a large dataset: further evidence of two distinct autoantibody systems

Jennie Ursum, Wouter H Bos, Rob J van de Stadt, Ben AC Dijkmans and Dirkjan van Schaardenburg*

Arthritis Research & Therapy 2009, 11:R75  doi:10.1186/ar2704

See related editorial by Valesini and Alessandri,

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