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Where did the virus acquire the furin cleavage site, since no other viruses in the sarbecovirus subgenus, to which its closest relatives belong, have this feature?

If this sounds like the setup for a smart, stinging contemporary comedy, of the imminent-empty-nest subgenus, it very much is.

Complicating matters is the decision to confine such an unconventional figure as Cher in the straitjacket of the biographical jukebox musical — particularly the tripartite diva subgenus most recently botched by “Summer: The Donna Summer Musical.”

It elevates the previously known snails from what had earlier been described as a subgenus, Opisthostoma, to the full genus of Plectostoma.

However, the two have been considered distinct enough at times that they’ve been given their own subgenera.