CCL3 and Pleural effusion: The same observations were made for MIP-1a serum (Ex: 22.2 ± 20.9 vs. T: 22.9 ± 8.7, p = 0.93) and pleural effusions (Ex: 19.0 ± 19.6 vs. T: 18.5 ± 7.9, p = 0.94) protein levels (ng/ml).