Regulation of the phosphoinositide hydrolysis pathway in thrombin-stimulated platelets by a pertussis toxin-sensitive guanine nucleotide-binding protein. Evaluation of its contribution to platelet activation and comparisons with the adenylate cyclase inhibitory protein, Gi - Brass, L F; Laposata, M; Banga, H S; Rittenhouse, S E (J Biol Chem, 1986)