Results from genomewide restriction enzyme digests have been precompiled and posted at http://www.neb.com/ ~posfai. For all prototype enzymes, site frequencies and densities, as well as average fragment lengths, appear here for mammalian, plant, and insect chromosomes, as well as for total genomic sequences. Site frequencies in one genome can be compared to site frequencies in other genomes, to frequencies predicted by first-order Markov models, or to frequencies in randomized sequences. Both the Markov models and the randomized sequences are based on actual genome dinucleotide counts.
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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.