University of Southern California Fertility Lab directory Mary Francis inspects human eggs frozen with liquid nitrogen. The clinic has been studying egg freezing and has now opened a commercial egg bank. Nationwide, the number of clinics offering egg banking is expected to double this year. Los Angeles Times photo by Bryan Chan. "We've got the recipe, now we need to fine-tune it," says Dr. [John Jain], a reproductive endocrinologist at USC Fertility. Los Angeles Times photos by Bryan Chan. Freezing eggs is difficult because ice crystals form that can destroy the cell.