Another type of misspelling is the insertion or deletion of one or more letters. The more we study the human genome, the more such misspellings than originally thought. The number of copies of an entire chromosomal region, which may contain one or more genes, can vary from person to person.
That is, your neighbor's gene banner design body may have two copies of the CCL3L1 gene (one on each of his two chromosome 17s), while your gene body may have five copies (two on 17 inherited from your mother) chromosome number 17, three on chromosome 17 inherited from the father). If that's the case, you're in luck, because the CCL3L1 gene is responsible for producing a protein that blocks the way the human immunodeficiency virus (HIV) enters immune cells; the more copies of the CCL3L1 gene, the less likely it is to get infected HIV.
This variation in the number of copies of genes has been found to be widely distributed, making the difference between the gene bodies of different people greatly increased to 0.5%, or a difference of 30 million letters. So would Clinton still claim that the 30 million letter difference is insignificant enough to explain the constant struggle between people? We call this the Clinton Paradox: On the one hand, human genomes are 99.5% identical. But on the other hand, the differences are as many as 30 million letters, which are hard to ignore and worthy of our closer exploration. Much of a person's height, skin color, and facial features are inherited; many of the more subtle variations that make us unique are also written in a component of our genes.