Tail vein bleeding time. Tail vein bleeding times of Pf4A and AlbB mice Tg⁺ are shown in seconds. Rescue mice (Tg⁺Fv^–/–) are compared with control littermates carrying the transgene and at least one wild-type Fv allele (Fv⁺ = Fv^+/– or Fv^+/+). The mean and SD are also indicated for each genotype.