Fig. 5. The response of intracellular calcium to methyl anthranilate (MA) in chick trigeminal ganglion neurons is dependent on extracellular calcium. This figure shows typical chick trigeminal neurons responding to (A) 100 mmol l^–1 MA and (B) 100 mmol l^–1 capsaicin (CAP). When the extracellular calcium is removed, the responses are null. When extracellular calcium is re-introduced the responses return.