A woman in Australia has given birth to identical quadruplet girls, a case doctors describe as exceptionally rare. The babies were conceived naturally from a single fertilized egg, a phenomenon estimated to occur in about 1 in 15 million spontaneous conceptions. This remarkable event is believed to be the first of its kind in Australia. AI
RANK_REASON The cluster describes a rare biological event, akin to a research milestone in human reproduction. [lever_c_demoted from research: ic=1 ai=0.0]
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