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There are stable ubiquitinated proteins in mammalian cell lysates even if active proteosomes exist in cells. First, you might want to make sure that the antibody is applicable to WB. Then, you would ask if your WB system using the antibody works. You could optimize the condition using just 1D SDS-PAGE followed by WB. For the condition for isoelectric ...


Purification and isolation of DNA bands by cutting them from agarose gel is commonplace (Lee et al., 2012). The purification step after excision of the band gets rid of most of the EtBr and other impurities. E.g., see the websites from Isogen and Sigma-Aldrich. Reference - Lee et al. J Vis Exp (2012); 62: e3923

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