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Ralph was the first cloned rat. He was created by a team of researchers at the National Institute for Agricultural Research in France, working with a biotech company, genOway . To give birth to Ralph, 129 embryos were implanted into two females, and one became pregnant and gave birth to three rats, with Ralph being the first to be born. [ 2 ]
The Middle East's first and the world's fifth cloned goat, Hanna, was born at the Royan Institute in Isfahan, Iran in 2009. The cloned goat was developed in the surrogate uterus of the Bakhtiari goat. Iranian researchers were reported in 2009 to be planning to use cloned goats to eventually manufacture new medications such as antibodies and ...
Climate change is contributing to a global rise in urban rat infestations, according to a new Science Advances study. As temperatures increase, rats are better able to thrive -- even in inclement ...
The brown rat (Rattus norvegicus), also known as the common rat, street rat, sewer rat, wharf rat, Hanover rat, Norway rat and Norwegian rat, is a widespread species of common rat. One of the largest muroids, it is a brown or grey rodent with a body length of up to 28 cm (11 in) long, and a tail slightly shorter than that. It weighs between 140 ...
Domestic rats differ from wild rats in many ways. They are calmer and less likely to bite; they can tolerate greater crowding; they breed earlier and produce more offspring; and their brains, livers, kidneys, adrenal glands, and hearts are smaller (Barnett 2002). Brown rats are often used as model organisms for scientific research.
A knockout rat is a genetically engineered rat with a single gene turned off through a targeted mutation (gene trapping) used for academic and pharmaceutical research. Knockout rats can mimic human diseases and are important tools for studying gene function (functional genomics) and for drug discovery and development. The production of knockout ...
The Polynesian rat, Pacific rat or little rat (Rattus exulans), or kiore, is the third most widespread species of rat in the world behind the brown rat and black rat.Contrary to its vernacular name, the Polynesian rat originated in Southeast Asia, and like its relatives has become widespread, migrating to most of Polynesia, including New Zealand, Easter Island, and Hawaii.
Some molecular phylogenetic studies have suggested that the New World rats and mice are not a monophyletic group, but this is yet to be confirmed. Their closest relatives are clearly the hamsters and voles. The New World rats and mice are divided into 3 subfamilies, 12 tribes, and 84 genera.