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Example sentences for: polonies
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For example, previous studies have shown that Panc-1 has two copies of K- ras 2, but only one copy of p53, due to LOH [ 20 ] . When equivalent quantities of Panc-1 genomic DNA were polony amplified, there were approximately twice as many K- ras 2 polonies as there were p53 polonies (Figure 3).
Prior to genotyping, the double stranded polonies were made single stranded by stripping away the non-acrydited strand in a two-step procedure [ 3 ] . The polony DNA was denatured by incubation in a formamide buffer (1x SSC, 70% formamide, 25% doubly deionized-water) at 70 C for 15 min.
As a result, polonies can be used to detect changes in gene copy number that arise due to either deletions or multiplications.
It should be noted that polony amplification of genomic DNA from strains with equal p53 and K- ras 2 copy numbers, such as CAPAN-1, yielded equivalent numbers of p53 and K- RAS 2 polonies (data not shown).
In addition polonies are used to diagnose LOH in these same genes.