Each has a slightly different chemical imprint which is vital for normal development.
Diagnosing mental illness in children can be difficult because young children often have trouble expressing their feelings and normal development varies from child to child.
Pesticides and other chemicals that could mimic estrogen and disrupt the normal development of salmon are present in the Columbia's water, Nagler said, but at very low concentrations - far below those used in laboratory experiments.
The US team showed that DISC1 plays a key role in normal brain development and the growth of individual neurons.
"We'll have a better opportunity to understand these disorders once we have a better grip on normal brain development", he told BBC News.
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Work by Dr. Gershon and others has shown that serotonin is necessary for the repair of cells in the liver and lungs, and plays a role in normal heart development and bone-mass accumulation.
The second thing the team did was to introduce a genetic mutation into the genome of the young egg that allowed for the production of a growth factor, a kind of protein, that can only come from the paternal genome but is vital for normal embryonic development.
Suspected human carcinogen, interferes with normal reproductive system development and thyroid hormone levels.
This was - and still is, unfortunately - considered to be a part of the normal, healthy development of the male adolescent.
The base is on Crown land and that means planning permission does not have to follow the normal procedure for any development on the site.
The scientists raised mice lacking normal gut microflora, then compared their behavior, brain chemistry and brain development to mice having normal gut bacteria.
But this is normal, the level of economic development is not the same and EU is not only an economic machinery but also a solidarity community.
For most, but not all, maintenance of a normal weight and a good diet will prevent development of type 2 diabetes.
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Iver parish councillor Alan Oxley said he had not had a chance to look at the detail yet but his immediate reaction was that as it was a development in the green belt, the "normal presumption" was to be against it, unless it proved to be in the public interest.
Hill believes water retention under the skin is a result of poor placental development, resulting in calves being much larger than normal.
Most health and human development indicators have shown no significant improvement beyond that which is normal in the midst of an oil boom.
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Similarly, a mouse which had its own gene controlling development of the eye replaced by the homologous fly gene developed a normal mouse eye.
In some cases, the European Commission has itself hampered the development of the single market by granting certain industries exemptions from the normal rules of fair competition.
The team believe that not only do the growth factors play a key role in development of the central nervous system, but also that too much of them may disrupt the normal process by which a cell develops into the correct type and moves to the right area, and dies at the right time.
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