primitive streak
(embryology) A formation that occurs during the initial phases of embryonic development in birds, reptiles and mammals.
plural of eigenscale
plural of paracone
(obsolete) Someone who honours their commitments only when it is personally easy to do so. / A person who conforms to current opinions, especially for reasons of personal advantage; an opportunist.
研究者は胚葉の起源を研究するために、顕微鏡で胚の原始線条を観察した。
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