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pbr
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The answer PBR has 21 possible clue(s) in existing crosswords.
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Definitions of pbr in various dictionaries:
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| In the U.S. it's a 3-letter abbrev. for a Pabst product; in China it's a premium ale that can run you upwards of $40 |
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| abbreviation for Public Borrowing Requirement: the amount of money that a government needs to borrow in a particular period: |
| abbreviation for payment by results a way of paying an employee by which they are paid more if they are more successful in their job and less if they are not so successful |
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pBR322 is a plasmid and was one of the first widely used E. coli cloning vectors. Created in 1977 in the laboratory of Herbert Boyer at the University of California, San Francisco, it was named after the postdoctoral researchers who constructed it. The p stands for "plasmid," and BR for "Bolivar" and "Rodriguez." * pBR322 is 4361 base pairs in length and has two antibiotic resistance genes – the gene bla encoding the ampicillin resistance (AmpR) protein, and the gene tetA encoding the tetracycline resistance (TetR) protein. It contains the origin of replication of pMB1, and the rop gene, which encodes a restrictor of plasmid copy number. The plasmid has unique restriction sites for more than forty restriction enzymes. Eleven of these forty sites lie within the TetR gene. There are two sites for restriction enzymes HindIII and ClaI within the promoter of the TetR gene. There are six key restriction sites inside the AmpR gene.The circular sequence is numbered such that 0 is the middle of the unique EcoRI site and the count increases through the TetR gene. The AmpR gene is penicillin beta-lactamase. Promoters P1 and P3 are for the beta-lactamase gene. P3 is the natural promoter, and P1 is artificially created by the ligation of two different DNA fragments to create pBR322. P2 is in the same region as P1, but it is on the opposite strand and initiates transcription in the direction of the tetracycline resistance gene. |