I am attempting to continue a conversation from the previous thread, which starts with this post from me:
It would save me effort if you had gone back to that thread and reviewed the exchange before posting your question, but I will attempt cliffs for you.
The argument is whether Covid-19 (SARS-CoV-2) is of natural origin (
Greco_Wiz's argument) versus lab origin (my argument). SARS-CoV-2 differs from SARS-CoV-1 in that SARS-CoV-2 has a furin cleavage site (FCS) in its genetic blueprint. The natural versus lab origin argument needs to explain how that furin clevage site got there.
The natural origin argument is that a SARS virus (without FCS) got together with another virus (with FCS) and produced SARS-CoV-2 (with FCS). This getting together is called recombination. Viruses are classified by genetic relatedness just like animals, so the question the natural origin argument must answer is: Which virus recombined with which virus to produce SARS-CoV-2? Greco_Wiz cannot answer this question except to acknowledge that the recombination partners would be so unlikely as to constitute a unique in history event, as I have described here: Now we come to my argument, of lab origin. There was literally a research proposal called DARPA to insert a furin cleavage site into a bat coronavirus. Alina Chan even got Linfa Wang to credit Ralph Baric (who has worked with Wuhan Institute of Virology’s Shi Zhengli) as being the origin of the FCS proposal.The circumstantial evidence is overwhelming, but can we see the evidence of human tampering in the SARS-CoV-2 genome itself? Genetic manipulation by humans involves cutting up larger genetic sequences into smaller ones, inserting extra genetic sequences, and reassembling into the larger sequence. The cutting is done by restriction enzymes (examples are BsmBI and BsaI that have been used in previous research) at restriction sites on the genetic sequence. Scientists insert extra restriction sites into a genetic sequence to make the cut up fragments more uniform in size. Greco_Wiz will not accept that the even-spacedness alone of BsmBI and BsaI in SARS-CoV-2 is evidence of lab origin because a minority of viruses also have even spacing. But the argument goes beyond just even spacing because two BsaI cut sites in Covid-19 (SARS-CoV-2) are found in the same location as previously mentioned engineered cut sites, published in 2017:
https://journals.plos.org/plospathogens/article/file?id=10.1371/journal.ppat.1006698&type=printable
So now, Greco_Wiz not only needs to account for the FCS in SARS-CoV-2 but also for the two BsaI cut sites, and he will never name specific recombination partners because there aren't any that make sense. But it makes perfect sense that scientists manipulated viral genetic sequences exactly following past published procedures to achieve the exact manipulation proposed: Inserting a furin cleavage site into a bat coronavirus proposed in DARPA, likely by Ralph Baric.