Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Phylogenetic distribution of menstruating species among eutherian mammals
Lineages in black are from menstruating species, and lineages in white from nonmenstruating species. The lineages with red outline are the lineages where menstruation originated. Note that there are at least 4 independent originations of menstruation.
Critchley. Menstruation: science and society. Am J Obstet Gynecol 2020.
