In Box 1 (p. 457), the entry for Variable number tandem repeat (VNTR) should read:
Variable number tandem repeat (VNTR) A VNTR region is a length of DNA that consists of a variable number of tandem repeats of a sequence of DNA. For example, in intron 2 of the serotonin transporter, there is a VNTR consisting of a variable number of repeats of a 17 base pair length of DNA, the common allelic variants having 9, 10, or 12 copies of this 17 base pair element.
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