RNase protection analysis on lymphocyte subsets. (Upper) LARD expression; (Lower) control protection using a β-actin probe. Lanes: 1, control (no RNA); 2, unstimulated PBL; 3, phytohemagglutinin (PHA)-blasted PBL; 4, CD4+ cells; 5, CD8+ cells; 6, B cells; 7, macrophages.