Levels of CRH-BP, CRH-R1 and CRH-R2 mRNA in the uterine corpus. Box and whisker plots represent mRNA levels of (A) CRH-BP, (B) CRH-R1, (C) CRH-R2 in the isthmic (co) and fundal (fun) samples, normalized to ribosomal 18S mRNA. The studied groups are: preterm labor (PTL), preterm not in labor (PTnotL), term labor (TL), term not in labor (TnotL), non-pregnant (NP). CRH mRNA was undetectable in most of these samples with the exception of two isthmic samples in PTnoL and two isthmic samples in TnotL groups. 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.