21. The ostium of the fallopian tube remains from the anterior extremity of the original tubular invagination from the abdominal cavity. 22. Optic cup morphogenesis is the invagination process occurring after neuroectoderm movement forms the spherical optic vesicle ( Phase 1 ). 23. FSL constructs will not actively pass through the plasma membrane but may enter the cell via membrane invagination and endocytosis. 24. It is typically the first step in any invagination process and is also important in folding tissues at specified hingepoints. 25. The invagination is pinched off, leaving the engulfed material in the membrane-enclosed vacuole and the cell membrane intact. 26. Dens invaginatus is a developmental anomaly resulting from invagination of a portion of crown forming within the enamel organ during odontogenesis. 27. It is mechanically easy to convert invaginations of embryos into a " midline " that defines an axis of bilateral symmetry. 28. Neural tube cells in " Xenopus " apically constrict during the initial invagination as well as during hingepoint folding. 29. Exosomes are formed by invagination within a cell to create an intracellular vesicle called an endosome, or an endocytic vesicle. 30. Each arises on the lateral aspect of the corresponding Wolffian duct as a tubular invagination of the cells lining the abdominal cavity.
