Up to 6% of women are born with extra breast tissue in their body.
The signatories include the American Medical Association, the American Nurses Association, and the American Academy of Pediatrics.
Some theories point toward a natural origin and others claim the virus accidentally leaked from a lab.
The first case of human monkeypox in the U.S. in nearly 20 years has been confirmed in a U.S. resident who recently returned from traveling to Nigeria.
The portion of DNA that's unique to modern humans is enriched for genes involved with brain development.
So far, lambda has been detected in 29 countries, with high levels of spread in South American countries.