| One of the major changes that occurs during the maturation of oocytes is the accumulation of yolk protein, or vitellin. |
| Mammalian females have a fixed number of oocytes at birth, which decreases dramatically with advancing age due to follicular atresia. |
| In sexual reproduction, spermatocytes develop from the transformation of choanocytes, and oocytes arise from archeocytes. |
| An alternative approach is cryopreservation of slices or biopsies of ovarian tissue, which contain many thousands of immature oocytes. |
| In some experiments, oocytes were microinjected with salt solution immediately before recordings. |
| Such a system is an adequate representation for some biological cells such as for example oocytes, the inner disc representing the nucleous. |
