File:Comparison human and opossum pregnancy.jpg

Comparison between the key stages of pregnancy in the opossum and human

The eutherian reproductive condition has evolved by inserting an anti-inflammatory period of gestation between the inflammatory attachment reaction and the inflammatory parturition reaction. Dashed arrows represent the two hypotheses that could explain how secondary inflammation arose in eutherians:

1) eutherian pregnancy can be understood either through the insertion of an antiinflammatory phase of pregnancy into what was one inflammatory process in the ancestral therian; or

2) by the addition of both an antiinflammatory phase and an independently derived secondary inflammation at parturition.

Links: opossum | implantation

Reference

Griffith OW, Chavan AR, Protopapas S, Maziarz J, Romero R & Wagner GP. (2017). Embryo implantation evolved from an ancestral inflammatory attachment reaction. Proc. Natl. Acad. Sci. U.S.A. , 114, E6566-E6575. PMID: 28747528 DOI.

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Proceedings National Academy of Sciences (PNAS) Liberalization of PNAS copyright policy: Noncommercial use freely allowed Note original Author should be contacted for permission to reuse for Educational purposes. See also PNAS Author Rights and Permission FAQs

Cozzarelli NR, Fulton KR, Sullenberger DM. Liberalization of PNAS copyright policy: noncommercial use freely allowed. Proc Natl Acad Sci U S A. 2004 Aug 24;101(34):12399. PMID15314225 "Our guiding principle is that, while PNAS retains copyright, anyone can make noncommercial use of work in PNAS without asking our permission, provided that the original source is cited."

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Cite this page: Hill, M.A. (2024, April 28) Embryology Comparison human and opossum pregnancy.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Comparison_human_and_opossum_pregnancy.jpg

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G