blastocoel

/ˈblæstəˌsil/
noun
  1. The fluid-filled cavity inside a blastula (an early stage of an embryo).
    • During gastrulation, cells migrate into the blastocoel to form new layers.
    • Researchers injected dye into the blastocoel to track cell movement.
    • The blastocoel is essential for the proper arrangement of cells in the early embryo.
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