This study compared two ways to freeze mouse embryos: the usual method and a new one called Ops vitrification. They then checked how well the embryos developed after being thawed. They found that both freezing methods were equally good at preserving the embryos. About 87% of embryos frozen traditionally and 86% frozen using Ops vitrification grew into the early stage of development. When they let the embryos continue to grow after thawing, 81% of those frozen traditionally and 84% of those frozen with Ops vitrification turned into more advanced embryos called blastocysts. This research suggests that OPS vitrification can preserve mouse embryos just as well as the usual freezing method.