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. Author manuscript; available in PMC: 2018 Feb 1.
Published in final edited form as: Protein Expr Purif. 2016 Oct 6;130:137–145. doi: 10.1016/j.pep.2016.10.001

Fig. 3. Addition of a 33% ammonium sulphate solution after nucleic acid removal by PEI visibly reduced contaminating proteins.

Fig. 3

SDS-PAGE of Pr55Gag: Lane 1, markers; lanes 2 and 3, total and supernatant fraction after PEI precipitation, respectively; lane 4, supernatant after addition of ammonium sulphate.