Examlex
The essential features of the Romanesque architectural style are:
Species-specific Protein
Proteins that are unique to a particular species and serve as identifying markers or perform specific biological functions not found in other species.
Zona Pellucida
A thick, transparent coating surrounding an oocyte (egg cell) and early embryo in mammals, playing a key role in fertilization by allowing sperm binding and inducing the acrosome reaction.
Vitelline Envelope
An acellular covering of the eggs of certain animals (e.g., echinoderms), located just outside the plasma membrane.
Granulosa Cells
The somatic cells in the ovary that surround developing female gametes (oocytes) and are involved in hormone secretion and oocyte maturation.
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