This volume contains the proceedings of the Twenty-fourth International Conference, held in Lyon from June 1st to June 3rd, 1992. Totalling just over 400 pages, the latest information on transplantation and clinical immunology is provided. Of the presented papers, the following is a random selection of published papers: "Experimental basis and clinical data pertinent to a transfusion effect" "Donor specific transfusions in renal transplantation" "Correlation of immune infiltrates in allografts with rejection" "Monitoring of rejection after pulmonary transplantation" "Local expression of cytokine genes during renal allograft rejection: In situ hybridization studies" "Use of non-invasive radiologic procedures in the diagnosis of kidney dysfunctions" "Monitoring of ATG therapy"