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There is increasing evidence that peptides of the gonadotropin-releasing hormone (GnRH) family, long considered a vertebrate preserve, are also present in invertebrate (molluscan) nervous systems. The possibility was examined that GnRHs are present and bioactive in cnidarians, considered to be...
Competitive receptor binding assays have been suggested as an in vitro screening tool for assessing the activity of alleged estrogenic substances. In this study, we determined the ability of steroidal and nonsteroidal substances to inhibit the binding of ( 3 H)17β-estradiol (E2) to the hepatic...
Expression patterns of TSHβ and FSHβ genes were investigated in normally metamorphosing and metamorphosed individuals and in goitrogen-treated (TU-SPC), metamorphosis-arrested larvae of a Japanese salamander, Hynobius retardatus, a particular population of which had been reported to show...
Total extracts of sinus glands (SG) of the euryhaline grapsid crab Pachygrapsus marmoratus contain peptidic factor(s) that stimulate osmoregulatory processes in isolated and perfused posterior gills from crabs acclimated to dilute seawater. This study investigated the nature of the active...
Estradiol modulation of granulosa cell growth and regulation of follistatin and inhibin α- and β B -subunit mRNA were investigated in cultured chicken granulosa cells. Granulosa cells were isolated and pooled according to size from the F 4 + F 5 , small yellow (SYF), and large white (LWF)...
The growth hormone receptor (GHR) cDNA was cloned from the liver of soft-shelled turtle ( Pelodiscus sinensis japonicus ) using the polymerase chain reaction (PCR). Although GHR has been cloned from several mammalian and avian species, this is the first description of the reptilian receptor. As...
Transthyretin (TTR) belongs to a group of proteins, which includes thyroxine-binding globulin and albumin, that bind to and transport thyroid hormones in the blood. TTR is also indirectly implicated in the carriage of vitamin A through the mediation of retinol-binding protein (RBP). It was first...
This investigation aimed to establish noninvasive methods for endocrine monitoring of estrous cycles and pregnancy in the Indian rhinoceros. Fecal samples were collected 1–3 times per week from nonpregnant and pregnant captive females ( n = 7). Enzyme immunoassays for fecal progesterone,...
Histomorphological changes and steroidogenic potential of the gonads during sexual differentiation and development were studied in Rana curtipes from tadpole stage 25 (Gosner) until maturity. In stage 25 tadpoles of smaller snout–vent length (SVL; 4–5 mm) the gonads were indifferent,...
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