proamnion
noun
pro·am·ni·on
-ˈam-nē-ˌän, -ən 
plural proamnions or proamnia
-nē-ə
: an area in the anterior part of the blastoderm of an early amniote embryo that is free of mesoderm
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“Proamnion.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/proamnion. Accessed 21 Nov. 2024.
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