Figure 2: Eight protein expression patterns classified according to their different responses to PA and PA + OA treatments.

Proteins were first grouped into three major categories based on their response to PA treatment: up-regulated (PA/control ≥ 2), down-regulated (PA/control ≤ 0.5), and unchanged (0.5 < PA/control < 2). Within each category, the proteins were further sorted into different subcategories according to their responses to PA + OA treatment.