What makes a good egg?

(University of California - San Diego) In approximately 15 percent of cases where couples are unable to conceive, the underlying cause of infertility is not known. Researchers at University of California San Diego School of Medicine and in the Division of Biological Sciences at UC San Diego have identified a protein in mice that must be present in eggs for them to complete normal development. Without the protein, called ZFP36L2 or L2 for short, the eggs appear ordinary, but they cannot be fertilized by sperm.
Source: EurekAlert! - Social and Behavioral Science - Category: International Medicine & Public Health Source Type: news