Intron-exon organization of TFPI and the mRNA structure of TFPIα and TFPIβ. (A) Schematic diagram depicting the intron-exon organization of TFPI. (B) TFPIα and TFPIβ mRNA species. (A and B) Each box represents an exon; the joining lines represent introns. The exons are numbered below the diagrams. Dashed lines represent alternative splicing events. The region of TFPI encoded by each exon is indicated within the box. Exons encoding regions specific to TFPIα are colored orange; those specific to TFPIβ are colored green. β, region specific to TFPIβ; C-term, C terminus; K, Kunitz domain; L, linker region; N-term, N terminus.