During ovarian development of female Eriocheir sinensis, PR-positive substances were detected mainly in follicle cells
, germinal cytoplasm of early ovarian stages (stages I-III), and oocyte nuclei of later ovarian stages (stages III-V).
The vacuolated follicular epithelium was broken and detached from the follicle cells
, with the appearance of patches of abnormal yolk-shaped bodies with splits and granular lines: these bodies indicate altered integration and processing of yolk, attesting to defective and asynchronous vitellogenesis.
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.m in diameter (Stricker et al., 2001; Norenburg and Stricker, 2002; Grange et al., 2011).
Moreover, follicle cells
were sporadically arranged around the oocyte (Fig.
Bone morphogenetic protein (BMP) ligands and receptors in bovine ovarian follicle cells
: actions of BMP-4, -6 and -7 on granulosa cells and differential modulation of Smad-1 phosphorylation by follistatin.
surrounding the vitelline coat release N-acetylglucosaminidase during egg activation , preventing the binding of all sperm but a few .
overlying the egg jelly coat are connected to the oocyte by microvillous extensions that form junctions with the elongate egg microvilli [ILLUSTRATION FOR FIGURE 16 OMITTED].
In many groups of animals, oocytes develop in close association with a surrounding sheath of follicle cells
as part of an integrated unit called a follicle (Raven, 1961).
were visible on the outer surface of the oocyte (Fig.
Instead, they collected tissue samples, which they analyzed in an effort to find out where exactly in hair follicle cells
Using tissue samples, the scientists tried to find out exactly where the LSS is located in the hair follicle cells
. The hair roots are formed in the follicle.