In the paper Network organization of the huntingtin proteomic interactome in mammalian brain, there is a description of a mass spectroscopy experiment where Bovine Serum Albumin (BSA) is added to a sample lysate and the same lysate without BSA was used as the control. I have a working knowledge of how mass spectroscopy works but I could not understand why BSA is used in this experiment. Can anyone help me?
This is probably a very trivial question. Excuse my ignorance, I am not a biology major. I tried google search to get an explanation for this but I didn't find anything satisfactory.