After studies in primates showed high levels of toxicity from GDNF, Amgen halted further human trials.
Do different groups of primates have different cultures and ways of interacting with each other?
Both Feynman and his upcoming book, Primates, are published by First Second, a division of Macmillan.
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Instead it seems that the Goualougo primates are learning the crafting techniques from other chimps.
Foursquare has also done a decent job of making its policy changes understandable to primates.
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Good thing there are a few other primates on the planet to set us straight.
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We have both a much longer childhood and a much larger brain than other primates.
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In recent years, this theme has even been extended to non-human primates, such as chimpanzees.
"It's a really important behaviour for primates and, of course, humans are primates too, " she says.
"I love to study primates and I also love to study humans, " he says.
Baboons and chimpanzees both belong to which of these groups: apes, monkeys, or primates?
Lemurs are primates so distantly related to humans they look more like cats than monkeys.
Others wanted to focus on experimental animals, like the C. elegans worm or primates.
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Madagascar is also home to 43 different primates, none better known than the ring-tailed lemur.
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They hope to begin implantation in primates soon, which would pave the way for eventual human trials.
But, Dr Shultz said, overall, "non-human primates, apes included, are not very good at solving fairness problems".
"There's evidence that some non-human primates are averse to others receiving more than they receive, " he said.
Tests in primates had suggested NA-1 prevented brain cells dying when a stroke starved them of oxygen.
Using a technique developed using primates, Professor Aziz drilled two tiny holes into Sean's head and inserted electrodes.
Slender lorises are small, nocturnal primates found only in the tropical forests of southern India and Sri Lanka.
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Dr Bergman said that this had not been seen in any other primates.
Primates held in captivity are at increased risk of death from heart-related disease.
Experiments on rodents and primates have shown that NGF can reverse memory loss.
Evolutionary palaeo-biologist Dr Simon Conway Morris believes they could even have evolved along the lines of primates or humans.
The function of copulation calls in female primates has been debated for years.
The team knew, from work done some time ago, that the first part of their hypothesis is true in primates.
Three men have been arrested in Delhi for trying to board a flight with small primates hidden in their underwear.
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Old-world primates, though, are big on visual communication, with coloured faces and (in the case of females) coloured sexual swellings.
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But other primates such as macaques can still be used - a point on which the Commission was overruled by MEPs.
"The problem is that no primates have ever been shown to produce vocalisations while making these facial movements, " explained Dr Bergman.
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