Histogram of N2 generation VWF plasma levels. Individual N2 mice were bled, and the results were averaged and normalized to an adult B6 plasma pool that was arbitrarily assigned a value of 10. The VWF antigen levels were binned and plotted as indicated on the x-axis. The locations of the parental strain and (B6 × WSB) F1 hybrid values are indicated by. These are 13.1, 24.8, and 35.3, for B6, F1, and WSB, respectively.