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He realized the female frogs used in Hogben's test could be replaced by South American male frogs or toads. Women's urine could be injected into the adult male frog's dorsal lymph sac. The gonadotropic hormone in the urine of pregnant women, after injection, would lead to the release of sperms from the frogs. [21]
The African clawed frog or platanna, Xenopus laevis, was first widely used in laboratories in pregnancy assays in the first half of the 20th century.When human chorionic gonadotropin, a hormone found in substantial quantities in the urine of pregnant women, is injected into a female X. laevis, it induces them to lay eggs.
The adult male frog measures 19.2-21.7 mm in snout-vent length and the adult female frog 19.3-22.0 mm. The skin of the dorsum is ochre in color. There is a dark brown lateral stripe and a cream stripe on each side of the body. The limbs can be ochre or orange in color.
Tyrone B. Hayes (born July 29, 1967) is an American biologist and professor of integrative biology at the University of California, Berkeley. He is known for his research in frogs, concluding that the herbicide atrazine is an endocrine disruptor that demasculinizes male frogs, causing them to display female characteristics. Hayes is an advocate ...
Endangered male frogs with an unconventional approach to child-rearing have 'given birth' to 33 tiny young in the UK as part of an urgent mission to rescue the species from a devastating fungal ...
Male Dendropsophus microcephalus calling. Sexual selection in amphibians involves sexual selection processes in amphibians, including frogs, salamanders and newts.Prolonged breeders, the majority of frog species, have breeding seasons at regular intervals where male-male competition occurs with males arriving at the waters edge first in large number and producing a wide range of vocalizations ...
The adult male frog measures 16.09 - 19.59 mm in snout-vent length and the adult female frog 17.97 - 20.84 mm. The skin of the dorsum is usually brown, suitably cryptic against the leaf litter. There is a mark in the shape of an hourglass on the frog's back. Most frogs also have a diffuse stripe on each side of the body.
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