The researchers compared two ways of freezing and storing mouse embryos in straws. They used different freezing solutions and techniques: one method involved slowly freezing the embryos, while the other method included a quick freeze (vitrification). After thawing the embryos, they studied how well they developed in the lab and when transferred to female mice. Interestingly, they found no significant differences in the development rates of embryos using these two freezing methods with ethylene glycol. Moreover, there were no significant differences in the success rates of embryos developing into live fetuses when comparing frozen embryos with fresh ones. The researchers suggest that thawing embryos after vitrification using a specific method works well, which can be useful for future embryo freezing procedures.