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Validation of SERPINB7 by Western blot analysis. a Relative protein expression level of SERPINB7 and SOD1 from iTRAQ data. Protein expression levels were normalized to control. b Validation of SERPINB7 (down-regulated protein in PTB) and SOD1 (unchanged protein in this study) in both PTB and control samples by Western blot. C, pooled control from 4 control CVF; P, preterm birth CVF
