Omicron has unique insertion mutation of putative viral/human genomic origin

From the abstract: "We compared the mutations of Omicron with prior variants of concern (Alpha, Beta, Gamma, Delta), variants of interest (Lambda, Mu, Eta, Iota and Kappa), and all 1523 SARS-CoV-2 lineages constituting 5.4 million SARS-CoV-2 genomes."

There must be a massive number of vaccine formula possibilities that will need to be tested.