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In early embryonic development, an oversight can take place giving the embryo some cells with two X chromosomes and several with three X chromosomes. Luckily, both types of cells continues to divide and since not every cells have the abnormal amount of X chromosomes the female is only going to experience mild, if any, symptoms. In September 2004 the EU implemented legislation that banned using over 1,000 chemicals of concern in personal care products. The prohibited chemicals were those known or strongly suspected of causing cancer, mutation, or birth defects. The EU ban has served being a wake-up demand many US companies who market a few overseas. In response some companies have replaced toxins in their goods, for example phthalates, parabens, and formaldehyde with non-toxic alternatives.