Human chorionic gonadotropin stimulates (*) oocyte production in these organisms, leading to their use in a pregnancy test which was commonly used until the development of immunoassays.  
They represent an invasive species threat in the San Francisco Bay area, and are a threat to native populations worldwide due to their being an immune carrier of Batrachochytrium dendrobatidis, the chytrid fungus.  Human chorionic gonadotropin stimulates (*) oocyte production in these organisms, leading to their use in a pregnancy test which was commonly used until the development of immunoassays.  Species in this genus like tropicalis are used if the pseudotetraploidy of the laevis species is undesirable.  Their unusually large oocytes are approximately 1 millimeter in diameter, leading to their best known use.  For 10 points, name this model organism of developmental genetics, a genus of clawed frogs native to sub-Saharan Africa.
They represent an invasive species threat in the San Francisco Bay area, and are a threat to native populations worldwide due to their being an immune carrier of Batrachochytrium dendrobatidis, the chytrid fungus.  
{Xenopus} frogs [accept X. {laevis} until mentioned] (5) [AU]