Ask and you shall receive. The lab made covid hypothesis looks pretty good to me based on my reading of the paper.
“Orf8 is an accessory protein, the function of which is largely unknown in most coronaviruses, although recent data suggests that Orf8 of SARS-CoV-2 mediates the evasion of host adaptive immunity by downregulating MHC-I24. Normally, Orf8 is poorly conserved in coronaviruses25. Sequence blast indicates that, while the Orf8 proteins of ZC45/ZXC21 share a 94.2% identity with SARS-CoV-2 Orf8, no other coronaviruses share more than 58% identity with SARS-CoV-2 on this particular protein. The very high homology here on the normally poorly conserved Orf8 protein is highly unusual.”
“The coronavirus E protein is a structural protein, which is embedded in and lines the interior of the membrane envelope of the virion26. The E protein is tolerant of mutations as evidenced in both SARS (Figure 2A) and related bat coronaviruses (Figure 2B). This tolerance to amino acid mutations of the E protein is further evidenced in the current SARS-CoV-2 pandemic… Consistent with this finding, sequence blast analysis indicates that, with the exception of SARS-CoV-2, no known coronaviruses share 100% amino acid sequence identity on the E protein with ZC45/ZXC21.”
“As elaborated below, the way that SARS-CoV-2 RBM [binding domain] resembles SARS-CoV RBM and the overall sequence conservation pattern between SARS-CoV-2 and ZC45/ZXC21 are highly unusual.“
“consistent with the RBM engineering theory, we have identified two unique restriction sites, EcoRI and BstEII, at either end of the RBM of the SARS-CoV-2 genome, respectively (Figure 5A). These two sites, which are popular choices of everyday molecular cloning, do not exist in the rest of this spike gene. This particular setting makes it extremely convenient to swap the RBM within spike, providing a quick way to test different RBMs and the corresponding Spike proteins. Such EcoRI and BstEII sites do not exist in the spike genes of other β coronaviruses, which strongly indicates that they were unnatural and were specifically introduced into this spike gene of SARS-CoV-2 for the convenience of manipulating the critical RBM.”
“Another unique motif in the Spike protein of SARS-CoV-2 is a polybasic furin-cleavage site located at the S1/S2 junction (Figure 4, segment in between two green lines)… Within the lineage B of β coronaviruses and with the exception of SARS- CoV-2, no viruses contain a furin-cleavage site at the S1/S2 junction (Figure 6)57. In contrast, furin- cleavage site at this location has been observed in other groups of coronaviruses57,58… although some coronaviruses from other groups or lineages do contain polybasic furin-cleavage sites, none of them contains the exact polybasic sequence present in SARS-CoV-2 (-PRRAR/SVA-)… and any coronavirus containing a legitimate furin-cleavage site, the sequence identity on Spike is no more than 40%.
close examination of the nucleotide sequence of the furin-cleavage site in SARS-CoV-2 spike has revealed that the two consecutive Arg residues within the inserted sequence (- PRRA-) are both coded by the rare codon CGG (least used codon for Arg in SARS-CoV-2) (Figure 7)8. In fact, this CGGCGG arrangement is the only instance found in the SARS-CoV-2 genome where this rare codon is used in tandem. This observation strongly suggests that this furin-cleavage site should be a result of genetic engineering. “