The rate of shared peanut allergy was compared between identical twins (who share all of their genes) and fraternal twins (who share about half of their genes).
(The rate of shared peanut allergy; was compared; between identical twins (who share all of their genes) and fraternal twins (who share about half of their genes) (identical twins; share; all of their genes)
The rate of shared peanut allergy identical twins
was compared share
between identical twins (who share all of their genes) and fraternal twins (who share about half of their genes
all of their genes