Thus, follicle cells
can stimulate or inhibit maturation, and such regulatory signals may be transported through the junctions at the follicle cell
The follicle cell
is a key cell in ovarian development of crustaceans, and the migration of follicle cells
could be used as an important indicator for the start of exogenous vitellogenesis in decapod crustaceans (Cheng et al.
2010) indicate destruction of follicular epithelium involving degeneration, hyperplasia and necrosis in follicle cells
, with regression in accumulation of yolk granules and with vacuolization of cytoplasm in male Rhyncophorus ferrugineus after treatment with chitin synthesis inhibitors flufenoxuron and botanical extract of neem.
As has been established by Selman and Wallace (1983), vitellogenin circulates in the blood and displaces among the endothelial cells of the capillaries, and subsequently among follicle cells
, reaching the region where microvilli are extending through the pores of the vitelline membrane (Selman and Wallace 1983, 1986, Smythe 2003).
are characteristically lacking during nemertean oogenesis, and in species such as Cerebratulus lacteus, Micrura alaskensis, and Par-borlasia corrugatus, numerous ovaries develop along the body, with each gonad producing dozens to hundreds of microlecithal oocytes that average 70-130 p.
Moreover, follicle cells
were sporadically arranged around the oocyte (Fig.
As has been established by Selman & Wallace (1983), vitellogenin circulates in the blood and displaces among the endothelial cells of the capillaries and subsequently among follicle cells
, reaching the region where microvilli extend through the pores of the vitelline membrane (Selman & Wallace 1983, 1986, Smythe 2003).
ABSTRACT The ultrastructures of germ cells and follicle cells
during oogenesis, the reproductive cycle, and the size at sexual maturity in female Meretrix lusoria were investigated for clams collected from Simpo, Korea by cytological, histological, and morphometric analysis.
Electron micrographs showed that normal follicle cells
appeared with homogenous ooplasm (Fig.
We interpret the dark outlines of follicle cells
to be due to the presence of trypan blue in spaces between the follicle cells
In the present study hair follicle cells
were isolated and grown by two different methods viz.
Tailless molgulid ascidians frequently lack the extracellular space normally found between the egg and the follicle cells
in tailed ascidian species, where the test cells reside as shown in Figure 2 (5).