Levels of CRH-BP, CRH-R1 and CRH-R2 mRNA in the cervical tissue. Box and whisker plots represent the mRNA levels of (A) CRH-BP, (B) CRH-R1, (C) CRH-R2 in the cervical tissue, normalized to ribosomal 18S mRNA. No CRH mRNA was detected in any of the cervical samples. The studied groups are: preterm labor (PTL), preterm not in labor (PTnotL), term labor (TL), term not in labor (TnotL), non-pregnant (NP). The numbers of samples analyzed for CRH, CRH-BP, CRH-R1 and CRH-R2 in each group are shown under the group name in the part A of the figure. Statistically significant differences are indicated above the plots.