<p>Plasma proteins were pre-treated with an albumin depletion kit and then separated according to their <i>p</i>I (IEF) and mass (SDS-PAGE). An average of 598 spots were detected per gel and further analyzed by MS or 2D database comparisons. The identified protein spots with differential expression related to HD duration were numbered and summarized in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0040232#pone-0040232-t002" target="_blank">Table 2</a>.</p
