Such conflicting results could be due to species-specific differences or to variations in experimental procedures such as the type of maturation inducer that is used and whether or not oocytes are associated with
follicle cells (Homa, 1995; Fan et al.
A single layer of
follicle cells surrounded the oocytes.
Ultrastructure of Germ Cells and
Follicle Cells During Oogenesis and Oocyte Degeneration
Ascidian eggs block polyspermy by two independent mechanisms, one at the egg plasma membrane, the other involving the
follicle cells.
Following this initial fusion, other microvilli become attached to the inner acrosome, including the larger microvilli that formerly anchored the
follicle cells [ILLUSTRATION FOR FIGURE 25 OMITTED].
In the articulate brachiopod Terebratulina retusa, the
follicle cells tend to be shed some time after spawning but apparently just prior to fertilization (James et al.
Because the oocytes apices were free even in the ovary studied in October, the flat cells maybe abnormal vestiges of
follicle cells.
After reaching the egg in the fallopian tube, a sperm that has undergone capacitation must make its way through the layer of small
follicle cells surrounding the egg.
The
follicle cells start to enclose the oocyte during the initial meiosis process (Fig.
mice, hair
follicle cells from a donor are multiplied and injected into the donor's scalp to create new hair.
It is generally considered that the binding of TGF-beta 1 receptors induces apoptosis of hair
follicle cells and triggers hair loss.
A transgenic mouse was created that is hairier than other mice, and mice
follicle cells were persuaded to grow hair after they were implanted in another animal, suggesting that a baldness cure might be possible.
