Endothelial Cells: Aortic, Umbilical Vein & Microvascular ECs stimulated by VEGF, assayed for activation of VEGFR2 signaling pathway, with others custom pre-screened by special request
Skeletal Muscle Cells stimulated with insulin & oligomycin, verified for activation of Akt, MAPK, AMPK & GSK cell signaling
Preadipocytes differentiated into Adipocytes, assayed for adipocyte & metabolic regulation markers, e.g. PPAR, CEBP, Insulin Receptor & Adiponectin
Cell signaling pathway strength varies, so researchers normally set aside valuable resources to screen cells for sensitivity to common stimuli.  Now they save time and do better science with pre-screened cells.