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Ovarian localization of glial cell-line-derived neurotrophic factor (GDNF) and GDNF receptor α1 (GFRα1) expression.
| Primordial | Primary | Pre-antrala | Antralb | |
|---|---|---|---|---|
| GDNF | ||||
| Oocyte | + + | + + | + + | + + |
| Granulosa | − | − | + | + + |
| Theca | − | − | + | + + |
| GFRα1 | ||||
| Oocyte | + + | + + | + | + /− |
| Granulosa | − | − | + | + |
| Theca | − | − | + + | + + |
Pre-antral follicles have three or more layers of granulosa cell.
Antral follicles have a fluid-filled antrum.
