Retrieved 10 December These 'epi-marks' can be inherited, but can also be altered by environmental factors such as smoking, and are not always shared by identical twins. Researchers also caution that just as known genetic associations offer scant insight into the mechanisms of sexual orientation, little can be concluded from the locations of the epi-marks.
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Douglas Wright. Before we can ask more intelligent questions we need to know who we are dealing with. University of Illinois Press.