Levels of Fv transgene expression. The level of Fv expression observed in the plasma (A) and platelet (B) pools of the transgenic Fv-null rescued mice (Tg⁺Fv^–/–) are shown here for all 6 albumin Fv BAC lines and one Pf4 Fv BAC line. The FV level observed in platelets or plasma of a control Fv^+/– mouse, corresponding to one endogenous copy of the normal Fv gene, is arbitrarily defined as 50%. SEs are indicated.