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pre-embryo

British  
/ priːˈɛmbrɪəʊ /

noun

  1. the structure formed after fertilization of an ovum but before differentiation of embryonic tissue

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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Other scientists have already used human stem cells to create a “blastoid, ” a structure mimicking a pre-embryo, that can serve as a research alternative to a real one.

From Seattle Times • Aug. 25, 2022

Scientists are using human stem cells to create a structure that mimics a pre-embryo and can serve as a research alternative to a real one.

From Seattle Times • Dec. 2, 2021

According to European Union regulations, a pre-embryo is considered tissue: it must be handled, stored, and transported according to a 2004 directive that also addresses bone marrow for transplants and skin for grafts.

From The New Yorker • Oct. 22, 2019

Conception, artificial or otherwise, is so uncertain that each pre-embryo, once it’s implanted, has only a one-in-three chance of growing into a human being.

From The New Yorker • Oct. 22, 2019

They then transferred a healthy pre-embryo to the mother's uterus.

From Time Magazine Archive