Drospirenone and ethinyl estradiol combination is used to prevent pregnancy. It is a birth control pill that contains two types of hormones, ethinyl estradiol and drospirenone, and when taken properly, prevents pregnancy. It works by stopping a woman's egg from fully developing each month. The egg can no longer accept a sperm and fertilization (pregnancy) is prevented.
Hematopoietic stem cells (HSCs) remain the most well-characterized adult stem cell population both in terms of markers for purification and assays to assess functional potential. However, despite over 40 years of research, working with HSCs in the mouse remains challenging because of the relative abundance (or lack thereof) of these cells in the bone marrow. The frequency of HSCs in murine bone marrow is about 0.01% of total nucleated cells and ∼5,000 can be isolated from an individual mouse depending on the age, sex, and strain of mice as well as purification scheme utilized.
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