Hy does anyone know of a vecor wich can be transfected stabely transfected into mouce cells without chromosomal integration. Simular to the vectors with Epstein-Barr virus sequences used in human cells, mostly for screening of expression cDNA libraries. Thanks Bart Depuydt Lab. Molec. Biol Ghent (Belgium) bartd at LMB1.rug.ac.be