(A) Representative microscopy image showing degranulation of PCMCs after 1a (C16:0 lyso-PS) or (R)-2d (C16:0) treatment (both 1 㭜M, 30 mins, 37 °C) in the presence of concanavalin A (Con-A) (black bar = 100 㭜m). (B) Histamine release profile from PCMCs treated with 1a (C16:0 lyso-PS) or (R)-2d (C16:0) or (S)-2d (C16:0) (1 nM to 10 mM, 30 mins, 37 °C, n = 3/data point). (C) Dose response and EC50 values for histamine release from PCMCs following treatment with the different (R)-Me-lyso-PSs (1 nM to 10 mM, 30 mins, 37 °C, n = 3/data point).