In 1986, Nature magazine published a letter from a hospital genetics dept:
https://picasaweb.google.com/101939326898768169409/20140227
This isn't a spoof - I dug the original paper copy of the magazine out of the library archive; the link above is my scan of it. The writers of the letter are legit, and the letter is referenced in Pubmed:
http://www.ncbi.nlm.nih.gov/pubmed/3762679
So.... what is that thing? It certainly looks like a manufactured as opposed to a natural structure.
(BTW, amniocentesis is the process of extracting fluid from around an embryo. It's used to test for genetic conditions, e.g Downs).
I'm off to the bunker to wait for the alien apocalypse. Talk amongst yourselves.