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The researchers noted that rates of monozygotic or identical twins - born from the same egg - were barely changed, stable at about 4 per 1,000 deliveries worldwide.

Identical, or monozygotic, twins occur when a single egg, fertilised by a single sperm, divides and makes two babies.

The twins made the band immediately recognisable, and spoke in interviews about the fact that their “monozygotic status” was seen as a gimmick which initially prevented people in the music industry from taking them seriously.

AFs are from the set of 3,621 samples, which contains at most one of the two monozygotic twins from each pair.

However, monozygotic and dizygotic adult twins have equally similar microbiota, suggesting environment rather than genetics may drive familial similarities.