It is presumed that the repeatedDNA sequences of the heterochromatin near the secondary constriction might be formed gradually in the process of evolution through unequal SCEs.
推测副缢痕附近异染色质的DNA重复序列可能是在进化过程中通过染色单体不均等交换而逐渐形成。
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Although this technique has proven its efficiency on several types of cells, its current utilization is limited to the detection of repeatedDNA sequences and requires the use of sequential reactions.
The reactions are typically carried out on a regulated heating block, or PCR machine, and consist of 30-35 cycles of repeated amplification of all the DNA present.