CD1a+ and CD1a- accessory cells from human bronchoalveolar lavage differ in allostimulatory potential and cytokine production - van Haarst,J.M.; Verhoeven,G.T.; de Wit,H.J.; Hoogsteden,H.C.; Debets,R.; Drexhage,H.A. (Am J Respir Cell Mol Biol, 1996)