Progesterone, which regulates cyclical changes in the endometrium of the uterus and maintains a pregnancy Reversing enlargement of blood vessels in the area they are applied to. They cause a narrowing of the blood vessels. Even though "keto" is a standard prefix in organic chemistry, the 1989 recommendations of the https://www.ird.gov.lk/en/Lists/QuickFeedback/DispForm.aspx?ID=262745