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Human embryonic stem cells have the potential to develop into eggs and sperm in the laboratory

... very earliest processes of how a human gamete and gonad (ovary and testis) develops. Many scientists believe that environmental chemical pollutants that mimic the action of hormones (so called endocrine disrupting chemicals) might interfere with human development at this stage and cause congenital abnorma...

Olfactory system detects pheromones that control reproduction

...s the estrus cycle. In males, the hormone controls gonad function, including spermatogenesis and testosterone production. "One of the classical dogmas is that LHRH neurons receive inputs from the vomeronasal system. For example, textbooks on reproductive physiology say that pheromonal modulation of reprod...

Study finds how organs monitor themselves during early development

...ications that extend beyond understanding of how a gonad such as the ovary develops," explains Dr. Ruth Lehmann, Ph.D., Julius Raynes Professor of Developmental Genetics and Howard Hughes Medical Investigator. "In every organ, may it be a gonad, a liver, or a thymus, different tissues contribute to the org...

Genetic tug of war determines sexual differentiation

...n the early stages of development in the mammalian gonad before it commits to either a male testis or a fem...f this equilibrium is tipped in favor of Wnt4, the gonad develops into an ovary, while an Fgf9 victory leads to the formation of a testis. What tips the bal...
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Abdomen

...l.2001) optic lamina (Huang and Kunes 1996,1998) gonad (Forbes et al.1996;Zhang and Kalderon 2000) abdomen (Struhl et al.1997) gut (Pankratz and Hoch 1995) trachea l system (Glazer and Shilo 2001). Full article >>>...
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Long-life genes - A new way to combat cancer…

...mor cells, when left undisturbed, break out of the gonad and fill the body, killing the worm at around 9 days old age. They then studied the effects of a few different 'longevity' genes in the tumor-affected animals, to assess the influence on lifespan and tumor growth. All of the longevity mutations te...

Feedback Loop Governing Ovarian Development Unraveled

...ications that extend beyond understanding of how a gonad such as the ovary develops," explains Dr. Ruth Lehmann, Ph.D., Julius Raynes Professor of Developmental Genetics and Howard Hughes Medical Investigator. "In every organ, may it be a gonad, a liver, or a thymus, different tissues contribute to the org...

Want a Baby? No Hot Baths Please !

...otential gonadotoxic factors – harmful to the male gonad – were identified. For the purposes of this study, wet heat exposure was defined as the immersion of the body in a hot tub, heated Jacuzzi or bath at a temperature warmer than body temperature for 30 minutes or more per week for at least three mont...
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Gonad shield set

This set includes 2 small, 1 medium, 1 large gonad shields and a belt. The shields and belt is an interchangeable system attached by velcro....
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Vomiting

...ween high levels of estrogen or human chorionic gonad otropin, a hormone that helps the unborn baby to develop. Full article >>> Vomiting causes the release of certain natural body chemicals called endorphins into the blood stream. 2 A surge of endorphins creates a natural euphoria. ...

Vas deferens

... temperature or luteinizing hormone peaks (see gonad otropic hormone ) in the female to determine whether ovulation is taking place, the ruling out of obstructions of the fallopian tube s or vas deferens , ... Full article >>> Ejaculatory duct : A canal in the male formed by union ...

Thyroiditis

...h ocytic thyroiditis , hypoparathyroidism , and gonad al failure. Full article >>> of the time it is seen in people with inflammatory bowel disease ( ulcerative colitis or Crohn's disease ). Primary biliary cirrhosis is more common in women, and is sometimes associated with autoi...

Testosterone

...the pituitary gland increases its production of gonad otropins, which in turn stimulate the production o...l , erythropoietin , estrogen , human chorionic gonad otropin (hCG), parat hormone , progesterone , and testosterone . Full article >>> e...

Testis

...tion in which there appears some male structures ( gonad , testis ), as well as a uterus , vagina , and fallopian tube s. Congenital adrenal hyperplasia . Full article >>> Testicular cancer affects the testis , the male sex glands in the scrotum that produce testosterone and ...

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