Matthew P Scott, Paul Matsudaira, Harvey Lodish, James Darnell, Lawrence Zipursky, Chris A Kaiser, Arnold Berk, Monty Krieger. Molecular Cell Biology, Fifth Edition. San Francisco: W. H. Freeman. 2004: 396. ISBN 0-7167-4366-3. ...in humans 1 centimorgan on average represents a distance of about 7.5x10E5 base pairs