Assertion: individual ancestor | /r/CapableOf | spawn the three domains
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text: However, Carl Woese et al., who first proposed the currently-used three domain system based on an analysis of ribosomal RNA (rRNA) sequences of bacteria, archaea, and eukaryotes, stated that in its genetic machinery, the LUCA would have been a "... simpler, more rudimentary entity than the individual ancestors that spawned the three [domains] (and their descendants)".