最終更新日：2025/11/20
During observation under the microscope, the biologist noted that the yolk plug was retracting as gastrulation progressed.
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During observation under the microscope, the biologist noted that the yolk plug was retracting as gastrulation progressed.
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元となった例文
顕微鏡観察中、生物学者は原口に囲まれた卵黄栓が原腸形成の進行に伴って収縮していることに気づいた。
