The range of FXIII specific activity (SA) observed for the different FXIIIA genotypes presented in Table 5. The genotype codes, explained in Table 4 and in the legend to Table 5, are 5′ to 3′ for codons 34-204-564-650-651. Individuals with FXIII SA of 2.43 and 2.58 (genotypes 11211 and 11311) are known to be heterozygous for FXIIIA deficiency and were not included in the normal population presented in Fig 2. Therefore, only one allele of genotype 11211 in both of these cases is probably responsible for the FXIII SA observed.