PD-1hi CXCR5- T peripheral helper cells promote B cells responses in lupus via MAF and IL-21.

Bocharnikov AV, Keegan J, Wacleche VS, Cao Y, Fonseka CY, Wang G, Muise E, Zhang KX, Arazi A, Keras G, Li ZJ, Qu Y, Gurish MF, Petri M, Buyon JP, Putterman C, Wofsy D, James JA, Guthridge JM, Diamond B, Anolik JH, Mackey MF, Alves SE, Nigrovic PA, Costenbader KH, Brenner MB, Lederer JA, Rao DA