We thank Dr. Roger Mark for reading the manuscript, and Vysis for permission and the option to use some of their beautiful FISH pictures for illustration when needed. We thank Marcel Dekker for their permission to reprint Figs. 11.2, 11.3, and 11.4 in Ref.  courtesy of Dr. John Anastasi, the lead author of the Anastasi and Roulston article. The support of colleagues and staff at the Presbyterian Laboratory Services (Cytogenetics Department) in Charlotte, North Carolina, is also acknowledged.
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The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.