DHFR DHFR(730-1293) DHFR DHFR(730-1293) SV40 poly(A) signal SV40 poly(A) signal(1510-1631) SV40 ... SV40 poly(A) signal(1510-1631) SV40 ... SV40 poly(A) signal(1510-1631) SV40 poly(A) signal SV40 poly(A) signal(7854-7988) SV40 ... SV40 poly(A) signal(7854-7988) ...SV40 SV40 poly(A) signal(7854-7988) SK primer SK primer(8339-8355) SK pr... SK primer(8339-8355) ...SK pr SK primer(8339-8355) PuroR PuroR(8860-9459) PuroR PuroR(8860-9459) SV40 poly(A) signal SV40 poly(A) signal(9689-9823) SV40 ... SV40 poly(A) signal(9689-9823) ...SV40 SV40 poly(A) signal(9689-9823) ori ori(10554-11142) ori ori(10554-11142) KanR KanR(11684-12499) KanR KanR(11684-12499) SK primer SK primer(8341-8357) SK pr... SK primer(8341-8357) ...SK pr SK primer(8341-8357) SV40 poly(A) signal SV40 poly(A) signal(9691-9825) SV40 ... SV40 poly(A) signal(9691-9825) ...SV40 SV40 poly(A) signal(9691-9825) SV40 poly(A) signal SV40 poly(A) signal(7856-7990) SV40 ... SV40 poly(A) signal(7856-7990) ...SV40 SV40 poly(A) signal(7856-7990) DHFR DHFR(732-1295) DHFR DHFR(732-1295)