Hi, Is there anyone to tell me what is the difference between following types of CHO cells? And Can I transfect them with PBK/RSV(with SV40 region)? Chinese Hamster Ovary (CHO) Cells Ltk-, CHO (DHFR-) Chinese Hamster Ovary (CHO) Cells Chinese Hamster Ovary Fibroblasts (CHO) Chinese Hamster Ovary(CHO) cells K1 Thanks, ChenLinan