VIIa_TF + X <-> VIIa_TF_X
VIIa_TF_X -> VIIa_TF_Xa
VIIa_TF_Xa <-> VIIa_TF + Xa
TFPI + Xa <-> Xa_TFPI
VIIa_TF + Xa_TFPI <-> Xa_TFPI_VIIa_TF
TFPI + VIIa_TF_Xa <-> VIIa_TF_Xa_TFPI
VIIa_TF_Xa_TFPI <-> Xa_TFPI_VIIa_TF
VIIa_TF_X + Xa_TFPI <-> VIIa_TF_Xa_TFPI + X