“The secretagogue acetylcholine (ACh) stimulated calcium mobilization from intracellular calcium stores at the base … EC50 of 14 μM. The muscarinic receptor antagonists 4‐DAMP, AF‐DX 384, pirenzepine … calcium signal with the following respective IC50 (pKb) values: 0.78 nM (…), 128 nM (7.1), and 2510 nM (5.8).”