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Basic proteins pH>7 are often produced recombinant and shouldn’t be precipitated by formic acid buffer.Associated membrane protein types are lipopolysaccharide selective barriers. Biological membranes include cell membranes, outer coverings of cells or organelles that allow passage of certain proteins and nuclear membranes, which cover a cell nucleus; and tissue membranes, such as mucosae and serosae.
Recombinants or rec. proteins