The scientists wanted to figure out which factors affect the health and potential of frozen embryos. They studied 742 embryos frozen using two methods - slow freezing and vitrification. The embryos were grouped based on how many cells survived after thawing. They found that vitrification and high quality were linked to better embryo health and potential development. Embryos with more cells and intactness on day 3 had higher chances of growing well. The study also showed that embryos with some cell damage can still be viable if they develop into good-quality blastocysts. Overall, vitrification seemed to work better for preserving embryos compared to slow freezing. So, when selecting embryos for freezing, it's important to consider their quality and cell count to improve the chances of successful transfer.