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Why do you use DBM instead of NCF in the northern blotting and what are the pre-treatments required for this paper to be used?

Answer:

diazobenzyloxymethyl paper that binds all single-stranded DNA, RNA, and proteins by means of covalent linkages to the diazonium group; used in situations where nitrocellulose blotting is not technically feasible

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What is the main objective of northern blotting?What is the nature of DBM paper in northern blotting?