Atypical twinning highlights that complex mechanisms responsible for twinning are not fully understood and may give further insight into the mechanisms involved. To assume that phenotypic difference is the result of dizygotic twinning would be erroneous and could have significant implications in the care and counseling provided to these patients.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6509934PMC
http://dx.doi.org/10.1002/ccr3.2113DOI Listing

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