Researchers then transferred samples from the guts of the three groups of mice into other germ-free mice.
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To make absolutely certain, the team used two different strains of parasite in different groups of mice.
Its researchers are now shooting sonic hedgehog directly into the brains of mice, to see what happens.
In fable elephants are afraid of mice, but in reality they seem to be more afraid of insects.
Then he set up a group of mice that were allowed to eat only 95% of that amount.
The genes of mice and human beings have been conserved by evolution, partly because changes to genes are lethal.
Dr Baker genetically engineered a group of mice that were already quite unusual.
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The scale of that work, though, hardly compares with today's quests to map the brains of mice and fruit flies.
It got its start in 1929 when Clarence Cook Little, a Harvard-trained geneticist, developed inbred strains of mice in order to study cancer.
To investigate GLP-1's role in taste, the team used a strain of mice that were genetically engineered to lack GLP-1 receptors.
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There are also a number of English set texts: To Kill a Mockingbird is one, Steinbeck's Of Mice and Men is another.
One such protein, the glutamate receptor, has been put under the control of a photoswitch and introduced into the retinas of mice.
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However, while this worked well in different types of mice, it is by no means certain that it would happen in humans.
The researchers exposed both groups of mice to two types of stress.
The teeming trillions of bacteria in the digestive tracts of mice have been shown to affect the animals' brain development and behaviour.
Scientists found that after injecting genes into the livers of mice, in some cases, the new genes became incorporated into the cells chromosomes.
In fact it eliminates the need to hold a controller entirely, just like the iPhone and iPad free users of mice and styluses.
The same biochemical changes took place in the brains of mice, and the mice in question were far less active than untreated mice.
However, only 15% of mice who had lived in cages where the tunnels and boxes were regularly moved around, fell off at the same age.
Researchers put two groups of mice on the same high-calorie diet.
None of the mice went into heart failure compared to 40% of DMD mice that had not had poloxamer 188 before being given the stressor drug.
Actor James Franco, star of Sam Raimi's Wizard of Oz prequel, is to make his Broadway debut in the John Steinbeck classic Of Mice and Men.
After this initial success, the researchers tested the effects of statins in living animals by injecting the drugs directly into the tissue overlying the skullcaps of mice.
No one knows exactly why a low-calorie diet extends the life of mice, but some researchers think it is linked to the rate at which cells divide.
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Low doses of hydrogen sulphide, a gas which smells like rotten egg, can safely reduce the metabolism of mice, putting them into a state of suspended animation.
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But in September, two independent groups reported that the same strain of mice, bred from animals furnished by the Brose lab, do not show any social deficits.
The two species of mice were successively bred, and those hybrids built long, two-tunnel burrows like oilfield mice - showing that the behaviour is a "dominant" trait.
Sands , CEO of Lexicon Genetics (nasdaq: LEXG - news - people), a genomics firm that knocks genes out of mice to discern their function.
In one experiment 60% of mice missing something called the gamma interferon receptor on their cells got tumors after being exposed to a carcinogen, versus only 15% of normal mice.
Puigserver and his colleagues found that SIRT1, the mammal version of the SIR2 gene, was turned on in the livers of mice when they were put on a calorie-restricted diet.
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