Pontarollo RA, Rankin R, Babiuk LA, Godson DL, Griebel PJ, Hecker R, Krieg AM, van Drunen Littel-van den Hurk S. Monocytes are required for optimum in vitro stimulation of bovine peripheral blood mononuclear cells by non-methylated CpG motifs. Vet Immunol Immunopathol. 2002 Jan 01; 84(1-2):43-59.