https://www.regeneron.com/science/technology link to their several videos of their tech.
VI mice are created by injecting mice embryos with genetically modified human DNA via BACvec Bacterial Artificial Chromosomes vectors.
I am going to assume their DNA is adult or cord sourced because it is cheap and plentiful. I am assuming that since they wanted to produce human covid antibodies it was gotten from recovered sick people.
Again, Regeneron plainly states that no fetal tissue was used in development or production and HEK was used only in efficacy testing. And HEK was sourced from a therapeutic abortion when it was the only legal kind allowed. So you will have to decide where your moral line is drawn.
Thanks for the info. The VI mice have been around at least since 2008, so pre covid. Or were you talking about the non-mouse part of the monoclonals?
I plan to keep digging on this and hopefully find out where they got the human DNA for their mice. A lot of information to sift through.
They said “no fetal tissue”. I’ve wondered if companies use this phrasing instead of “no fetal DNA” as an end run around the ethics issue.