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[1]"Characterization of a new human B7-related protein: B7RP-1 is the ligand to the co-stimulatory protein ICOS."Yoshinaga S.K., Zhang M., Pistillo J., Horan T., Khare S.D., Miner K., Sonnenberg M., Boone T., Brankow D., Dai T., Delaney J., Han H., Hui A., Kohno T., Manoukian R., Whoriskey J.S., Coccia M.A.Int. Immunol. 12:1439-1447(2000). [2]"Identification of GL50, a novel B7-like protein that functionally binds to ICOS receptor." Ling V., Wu P.W., Finnerty H.F., Bean K.M., Spaulding V., Fouser L.A., Leonard J.P., Hunter S.E., Zollner R., Thomas J.L., Miyashiro J.S., Jacobs K.A., Collins M.J. Immunol. 164:1653-1657(2000). [3]"Human plasma N-glycoproteome analysis by immunoaffinity subtraction, hydrazide chemistry, and mass spectrometry."Liu T., Qian W.-J., Gritsenko M.A., Camp D.G. II, Monroe M.E., Moore R.J., Smith R.D. J. Proteome Res. 4:2070-2080(2005).