Platelet counts, MPVs, and thrombocrits in transgenic animals. (A) The graph shows the distribution of platelet counts in the different transgenic animals, from left to right: mPF4−/−, mPF4+/−, WT, hPF4×6+, and hPF4×6+/+. Mean value is indicated by horizontal bar for each phenotype. n indicates number of animals studied. *P < .02 and **P < .001 compared with WT littermates. (B) MPVs for each animal type are shown + 1 SD. n indicates number of animals per arm. *P < .003 compared with WT littermates. (C) The mean thrombocrit in each animal type is shown + 1 SD. n indicates number of animals per arm. *P < .03 and **P < .005 compared with WT littermates.