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PD-L2 is a second ligand for PD-1 and inhibits T cell activation.
Latchman Y, Wood CR, Chernova T, Chaudhary D, Borde M, Chernova I, Iwai Y, Long AJ, Brown JA, Nunes R, Greenfield EA, Bourque K, Boussiotis VA, Carter LL, Carreno BM, Malenkovich N, Nishimura H, Okazaki T, Honjo T, Sharpe AH, Freeman GJ. Latchman Y, et al. Nat Immunol. 2001 Mar;2(3):261-8. doi: 10.1038/85330. Nat Immunol. 2001. PMID: 11224527