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A shortage of genes could be to blame for the lack of height in short people, researchers have found. Two studies involving 12,000 people has been carried out in America and found a link between the amount of missing genetic material and a decrease in height. Height is mostly passed down through families but scientists say this does not explain everything when comparing the variations between people. Dr Joel Hirschhorn, who led a study published in the American Journal of Human Genetics, said: "Despite tremendous recent progress in finding common genetic variants associated with height, thus far these variants only explain about 10 percent of the variation in adult height." | 
