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Some text in this article was originally taken from http://ghr.nlm.nih.gov/gene=brca1 (public domain)
I altered this article by adding "faulty" into the sentence "Women and men who inherit a copy of this gene...". This is because it is not the gene which causes an increased risk of cancer, but the presence of a faulty copy of the gene. A faulty copy means the gene's tumour-suppressing abilities cannot be expressed.