Impact of mutations in the C-terminal tyrosines of LAT on PI3K and PLC activation in response to GPVI triggering. [32P]-labeled platelets from WT (♦) and Lat3YF (■) (A) or from WT (Rag−/−) (♦) and LatY136F mice (●) (B) platelets were stimulated by 5 nM Cvx for the indicated times and the levels of [32P]-PtdIns(3,4,5)P3, [32P]-PtdIns(3,4)P2, [32P]-PtdIns(4,5)P2, and [32P]-PtdOH were analyzed as indicated in “Platelet preparation and in vitro aggregation studies.” Results are means (± SEM) of 4 experiments.