The second carbon is connected to the amino group. Amino means there is an NH 2 group bonded to the carbon atom. In the image, you see a + and a -. Those positive and negative signs are there because, in amino acids, one hydrogen atom moves to the other end of the molecule. An extra H gives you a positive charge.
Ranges of normal estrogen levels are measured in parts pg/ml of estradiol. In normal reproductive age women, during the menstrual cycle, estradiol levels range from 50-400 pg/ml. The actual normal level of estrogen varies during different parts of the menstrual cycle. In menopause, the general range may be 10-20 pg/ml.
Even so, the levels of it found in females, depending on age, health status, and lifestyle, may vary. The University of Rochester Medical Center has defined normal levels of testosterone in women to range 15 to 70 ng per deciliter (ng/dL). Females taking injections of the hormone should do so only with a doctorâs knowledge and oversight.