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Related Concept Videos

Meiosis II01:57

Meiosis II

Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each containing...
Oogenesis01:22

Oogenesis

Oogenesis,  the process of developing egg cells (female gametes), occurs within the ovaries and is fundamental to female fertility. This sequence begins during fetal development when diploid oogonia in the developing ovaries undergo mitotic divisions to produce primary oocytes. By birth, these primary oocytes enter prophase I of meiosis but become arrested in this stage, remaining suspended until puberty.
Each primary oocyte is surrounded by a layer of pre-granulosa cells, forming what is known...

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Related Experiment Video

Updated: Jul 1, 2026

Fertility Preservation Through Oocyte Vitrification: Clinical and Laboratory Perspectives
08:46

Fertility Preservation Through Oocyte Vitrification: Clinical and Laboratory Perspectives

Published on: September 16, 2021

Oocyte cryopreservation.

E Albani1, J Barbieri, P V Novara

  • 1UO di Medicina della Riproduzione, IRCCS Istituto Clinico Humanitas, 20089 Rozzano, Milan, Italy. elena.albani@humanistas.it

Placenta
|November 1, 2008
PubMed
Summary
This summary is machine-generated.

Human oocyte cryopreservation using slow-freezing shows improved pregnancy and implantation rates over time. This technique offers a viable option for fertility preservation, even with embryo cryopreservation restrictions.

Related Experiment Videos

Last Updated: Jul 1, 2026

Fertility Preservation Through Oocyte Vitrification: Clinical and Laboratory Perspectives
08:46

Fertility Preservation Through Oocyte Vitrification: Clinical and Laboratory Perspectives

Published on: September 16, 2021

Area of Science:

  • Reproductive Medicine
  • Cryobiology
  • In Vitro Fertilization

Background:

  • Renewed scientific interest in human oocyte cryopreservation.
  • Debate surrounding the efficacy and safety of oocyte freezing.

Purpose of the Study:

  • Analyze clinical data from extensive experience with slow-freezing human oocytes.
  • Evaluate the effectiveness of oocyte cryopreservation over a seven-year period.

Main Methods:

  • Utilized a slow-freezing protocol with 1,2-propanediol and sucrose.
  • Performed 1280 thawing cycles between 2001 and 2007.
  • Microinjected 3622 thawed oocytes.

Main Results:

  • Achieved 144 clinical pregnancies from 7585 thawed oocytes.
  • Observed a significant increase in thawing cycles and thawed oocytes annually.
  • Demonstrated steady improvement in pregnancy (6.7% to 15%) and implantation (2.4% to 8.2%) rates from 2001 to 2007.

Conclusions:

  • Oocyte cryopreservation shows clinically significant improvements with experience.
  • Slow-freezing is a viable standard of care for fertility preservation.
  • Offers an alternative for patients avoiding embryo cryopreservation or facing legal restrictions.