CD19 and BAFF-R can signal to promote B-cell survival in the absence of Syk.
Hobeika E, Levit-Zerdoun E, Anastasopoulou V, Pohlmeyer R, Altmeier S, Alsadeq A, Dobenecker MW, Pelanda R, Reth M. CD19 and BAFF-R can signal to promote B-cell survival in the absence of Syk. EMBO J. 2015 Apr 01; 34(7):925-39.