Tissue distribution of TFPIα and TFPIβ mRNAs in mouse tissues. Levels of TFPIα and TFPIβ mRNAs in various tissues were determined by Northern blotting using 10 μg RNA for each tissue. Loading was assessed by reprobing the blot with a GAPDH probe. TFPIα mRNA is 1.3 kb and TFPIβ mRNA is 4.0 kb.