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    Area of Science:

    • Reproductive Biology
    • Cryobiology
    • Animal Genetics

    Background:

    • Embryo cryopreservation is crucial for archiving mouse strains.
    • Existing protocols exhibit significant variability in techniques and materials.
    • Advancements aim to improve efficiency and accessibility of cryopreservation.

    Purpose of the Study:

    • To describe a specific rapid-cooling cryopreservation protocol for mouse embryos.
    • To highlight the advantages of rapid cooling over traditional methods.
    • To present a protocol suitable for plastic insemination straws.

    Main Methods:

    • Equilibration of embryos with cryoprotectant solutions.
    • Loading embryos into carriers (plastic insemination straws).
    • Rapid cooling by direct immersion in liquid nitrogen (LN2).

    Main Results:

    • Rapid cooling prevents ice crystal formation by reducing cellular water content.
    • This method eliminates the need for controlled-rate freezers and seeding.
    • The described protocol is less technically demanding due to larger volumes and suitability for straws.

    Conclusions:

    • Rapid cooling offers a viable alternative for mouse embryo cryopreservation.
    • The protocol is effective and accessible, particularly for archiving mouse strains.
    • Further optimization may enhance its widespread adoption.