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Impact of interleukin-21 in the pathogenesis of primary Sjogren's syndrome: increased serum levels of interleukin-21 and its expression in the labial salivary glands

Kwi Young Kang, Hyun-Ok Kim, Seung-Ki Kwok, Ji Hyeon Ju, Kyung-Su Park, Dong-Il Sun, Joo Yeon Jhun, Hye Jwa Oh, Sung-Hwan Park* and Ho-Youn Kim*

Arthritis Research & Therapy 2011, 13:R179  doi:10.1186/ar3504

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