Progesterone is a hormone released by the corpus luteum in the ovary. It plays important roles in the menstrual cycle and in maintaining the early stages of pregnancy. It may also be involved in the growth of certain cancers.
I've been following various people's posts about the GRE for 10 months now. Some people don't study at all for the GRE, some study for a weekend, the average is about 2 to 3 months, and some study for a year or more.
Graduate Record Examination (GRE) test for admission into US Graduate programs is valid for five years from the date of test. Suppose if you take GRE on 30th May 2012, your score will be valid till 29th May 2017. You can use GRE score to apply to US Universities with in the 5 year un-expired period.es, you can apply to US Schools any time before GRE test score expiration. If your GRE is is not valid by the time the university review your application, they may ask you to retake the test. I have old GRE score and the test is taken with in last 5 years.