"Evidence indicating omicron evolved in mice."

I've posted many times that Leronlimab is a murine derived (mice) humanized monoclonal antibody. -- Meaning our humanized MAB did not come from primates, but rodents.

Now, in the light of CTMedics post about Omicron coming from mice, I am unable to verify this info, that LL came from the rodent Immune cells.

Can anybody help me verify or deny?

Thanks,
chazzle