[1] ST JUDES CHILDRENS RES HOSP, DEPT TUMOR CELL BIOL, MEMPHIS, TN 38105 USA
[2] ST JUDES CHILDRENS RES HOSP, DEPT HEMATOL ONCOL, MEMPHIS, TN 38105 USA
[3] CETUS CORP, DEPT CELL BIOL, EMERYVILLE, CA 94608 USA
[4] YESHIVA UNIV ALBERT EINSTEIN COLL MED, DEPT MICROBIOL & IMMUNOL, BRONX, NY 10461 USA
[5] YESHIVA UNIV ALBERT EINSTEIN COLL MED, DEPT CELL BIOL, BRONX, NY 10461 USA