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Nature Immunology 2, 261–268 (1 March 2001) | doi:10.1038/85330

PD-L2 is a second ligand for PD-1 and inhibits T cell activation

Yvette Latchman , Clive R. Wood , Tatyana Chernova , Divya Chaudhary , Madhuri Borde , Irene Chernova , Yoshiko Iwai , Andrew J. Long , Julia A. Brown , Raquel Nunes , Edward A. Greenfield , Karen Bourque , Vassiliki A. Boussiotis , Laura L. Carter , Beatriz M. Carreno , Nelly Malenkovich , Hiroyuki Nishimura , Taku Okazaki , Tasuku Honjo , Arlene H. Sharpe & Gordon J. Freeman