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What is the chemical formula for pBr32?

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What is the chemical formula for pBr32?
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pBr32 is the name of a plasmid used for cloning fragments of DNA. A plasmid is a small circle of DNA that a bacteria can replicate but which is not part of the bacteria's chromosome.
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it is pBr3. PHOSPHOROUS TRI BROMIDE. STRUCTURE . . SNONYMS tribromophosphine . . . MOLECULAR FORMULA PBr3 . . MOLECULAR WEIGHT 270.70 . . CAS No. 7789-60-8 . . APPEARANCE PALE YELLOW TO COLOURLESS CORROSIVE LIQUID . (May become turbid on storage ) . . . ASSAY. (BY ARGENTIMETRY) 98.0 % MIN (MOISTURE SENSITIVE ) . . . SPECIFIC GRAVITY 2.88 AT 20 ° C . . BOILING POINT 172 - 175 ° C
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