Words similar to fissions

Example sentences for: fissions

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The latter two scenarios were distinguished on the basis of the parsimony principle, that is, by counting the number of evolutionary events (fusions or fissions) that were required to produce the observed distribution of fusion components and stand-alone versions of the domains involved across the tree branches.
Among fusions that are found in at least two of the three primary kingdoms of life (Bacteria, Archaea and Eukaryota), we detected both modes of evolution, but horizontal transfer of a fused gene appeared to be more common than independent fusion events or vertical inheritance with multiple fissions.
In other words, is a fusion of a given pair of genes extremely rare and, once formed, is it spread by horizontal gene transfer (HGT) perhaps also followed by fissions in some lineages?
It cannot be ruled out that some of the scenarios we classify as independent fusions in reality reflect the existence of an ancestral fused gene and subsequent multiple, independent fissions.