AP Medical Writer Don't count on freezing eggs to offset a ticking biological clock just yet. So say new guidelines for fertility specialists that conclude the procedure remains highly experimental even though it is increasingly offered. The recommendations are a dash of cold water for a field that proponents believe is slowly coming of age. But with perhaps 500 births from frozen-and-thawed eggs worldwide, compared with more than 200,000 from frozen embryos, it is a nascent technology. Now scientists are tweaking techniques to try to improve the odds that a woman who has her eggs removed and frozen will bear...