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(a) Volcano plot of gestation-pen and farrowing-pen combined housing system (PP) vs gestation-crate and farrowing-crate combined housing system (CC) differential expression protein. (b) Volcano plot of gestation-pen and farrowing-crate combined housing system (PC) vs CC differential expression protein. Note: Ratio of differential protein expression over 1.3 was the significant change threshold (p < 0.05).
