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No
What is the question?
Parenchyma
A nipple is a nipple, simple as that. The sometimes darker // pinker skin around the nipple is called the aureole.
http://www.babiestravellite.com/NRTFON/NUK-Ready-To-Feed-Orthodontic-Nipple.html
That's the only place I've seen them. I personally just buy the Nuk Nipples at babies r us and the 4 pack of generic nipple rings.