Evaluation results of the number of true positive differential abundance proteins (spiked proteins) on benchmark dataset PXD002099. The performance of each FS method was evaluated based on the number of true positive markers. Each sub-plot demonstrated that the number of true positive markers based on the different concentration pairs. Blue, the top 1 on the performance; red, the top 2 on the performance; green, the top 3 on the performance. UPS1 proteins indicated the true positive markers.