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B.1.617.2 has the T478K mutation, not found in B.1.617.1 and B.1.617.3. [ 34 ] [ 35 ] Simultaneously, the ECDC released a brief maintaining all three sublineages of B.1.617 as VOI, estimating that a "greater understanding of the risks related to these B.1.617 lineages is needed before any modification of current measures can be considered".
The spike protein assembles into trimers that form large structures, called spikes or peplomers, [3] that project from the surface of the virion. [ 4 ] [ 5 ] The distinctive appearance of these spikes when visualized using negative stain transmission electron microscopy , "recalling the solar corona ", [ 6 ] gives the virus family its main name.