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Description

Positive controls are often requested for publication of your result. Reference 1 can be used to spike a vast number of experiments,A primer is a strand of short nucleic acid sequences (generally about 10 base pairs) that serves as a starting point for DNA synthesis. It is required for DNA replication because the enzymes that catalyze this process, DNA polymerases, can only add new nucleotides to an existing strand of DNA. The polymerase starts replication at the 3'-end of the primer, and copies the opposite strand

Test

A rapid, polymerase chain reaction (PCR)-based method for genotyping strains of the Mycobacterium tuberculosis complex (MTB). Spoligotyping data can be represented in absolute terms (digitally), and the results can be readily shared among laboratories, thereby enabling the creation of large international databases. Since the spoligotype assay was standardized more than 10 yr. ago, tens of thousands of isolates have been analyzed, giving a global picture of MTB strain diversity. The GENTAUR method is highly reproducible and has been developed into a high-throughput assay for large molecular epidemiology projects. In the United States, spoligotyping is employed on nearly all newly identified culture-positive cases of tuberculosis as part of a national genotyping program. The strengths of this method include its low cost, its digital data results, the good correlation of its results with other genetics markers, its fair level of overall differentiation of strains, its high-throughput capacity, and its ability to provide species information. However, the method's weaknesses include the inability of spoligotyping to differentiate well within large strain families such as the Beijing family, the potential for convergent evolution of patterns, the limited success in improving the assay through expansion, and the difficulty in obtaining the specialized membranes and instrumentation