GM-CSF–mediated JAK-2/STAT-5 activation in LAMA cells. (A) FACS histograms illustrate the levels of expression of intracellular phosphorylated JAK-2 (ic-p-JAK-2) and (B) the quantity of ic-p-STAT-5 after treatment of parental LAMA cells for 48 hours with indicated inhibitors with or without GM-CSF.