The study compared two methods of freezing mouse eggs to see which one worked better. They found that vitrification was more effective than slow cooling in preserving the eggs and helping them develop. Eggs at an earlier stage were more resistant to damage from freezing compared to more mature eggs. Both methods had similar success rates in fertilization and maturation of the eggs. Vitrification also showed better preservation of the egg's internal structure. Overall, vitrification is a better choice for freezing mouse eggs for future use.