The proteins affected most frequently in the studies of women with PTB against women without PTB.

Index:(S)PTB = (Spontaneous) Preterm birth.2D-CF = 2D chromatographic fractionation.AF = Amniotic fluid.APO = Apolipoprotein.ELISA = Enzyme-linked immunosorbent assays.ESI-IT MS = Electrospray ionization-ion trap mass spectrometry.HPLC = High performance liquid chromatography.IAI = Intra-amniotic Infection/Imflammation.iTRAQ = Isobaric tag for relative and absolute quantitation.LC MS/MS = Liquid chromatography – tandem mass spectrometry,MALDI-TOF = Matrix-assisted laser desorption time-of-flight,MS = Mass spectrometry,PTB = Preterme birth.PTL = Preterm labour,RP-HPLC = Reversed-phase high performance liquid chromatography,SCX chromatography column = Strong cation exchange column,SDS-PAGE = Sodium dodecyl sulfate-polyacrylamide gel electrophoresis,SELDI-TOF = Surface-enhanced laser desorption ionization time-of-flight;WB = Western blotting.