@ Jikky's, it's retrotransposons. These link to ancient fish, so what happened to the Wuhan seafood market hypothesis?
'....retrotransposons....'
@ USMB, we've already linked both world hemispheres for SARS2 "viral parts" RGD and furin. Here we support Jikky with ancient fish linked to Michael Worobey's study on foamy viruses of coelacanths (USMB search):
France-Korea / Retrotransposons of Foamy Virus
Foamy viruses (FV) are retroviruses belonging to the <i>Spumaretrovirinae</i> subfamily. They are non-pathogenic viruses endemic in several mammalian hosts like non-human primates, felines, bovines, and equines. Retroviral DNA integration is a mandatory step and constitutes a prime target for...
pubmed.ncbi.nlm.nih.gov
The basin we refer to, "Chenjiang fauna" also contains the bat cave where all of the necessary parts were in place to produce SARS1: southern shore of Dian Lake, south of Kunming (Chan and Ridley, Viral):
Sep 2002 Chenjiang, Yunnan
We report the discovery of a new agnathan specimen from the Lower Cambrian Chengjiang Lagerstätte of China and thereby provide new evidence on the myomeres (V-shaped), the branchial apparatus (gill filaments and arches), the dorsal fin and the gonads (24-26) of the earliest vertebrates. The new...
pubmed.ncbi.nlm.nih.gov
'....Myllokunmingia fengjiaoa and Haikuichthys ercaicunensis represent a single species.'
Interestingly, Political Chic was first to mention Haikuichthys here (USMB search).
It's definitely a mistake to forget that the first human to sequence SARS2, Yong-Zhen Zhang, also attended Kunming Institute of Zoology. It's also a mistake to get amnesia about his co-author, E.C. Holmes (Sydney, Australia), who is linked to Oxford Zoology Institute.
U. Toronto / Metaspriggina
Knowledge of the early evolution of fish largely depends on soft-bodied material from the Lower (Series 2) Cambrian period of South China. Owing to the rarity of some of these forms and a general lack of comparative material from other deposits, interpretations of various features remain...
pubmed.ncbi.nlm.nih.gov
'....Phylogenetic analysis places Metaspriggina (Cambrian Burgess Shale) as a basal vertebrate, apparently close to Chengjiang taxa Haikuichthys and Myllokunmingia, demonstrating that this primitive group of fish was cosmopolitan during the Lower-Middle Cambrian times.'
These phylogenetic studies support the hypothesis that many of these ancient fish, like Worobey's coelacanth, were infected with harmless foamy viruses.