[1] HUNGARIAN ACAD SCI, INST BIOCHEM, H-6701 SZEGED, HUNGARY
[2] HUNGARIAN ACAD SCI, BIOL RES CTR, INST BIOPHYS, H-6701 SZEGED, HUNGARY
[3] UNIV CONNECTICUT, DEPT ANIM GENET, STORRS, CT 06268 USA
[4] EUROPEAN MOLEC BIOL LAB, D-6900 HEIDELBERG, FED REP GER
[5] LA JOLLA CANC RES FDN, CANC RES CTR, LA JOLLA, CA 92037 USA