“2 Amlodipine (0.5–2 × 10−4 M), verapamil (… × 10−4 M), lignocaine (0.1–2 × 10−3 M) … cobalt (2–6 × 10−2 M) in descending order of potency, but not nifedipine (1–5 × …, then abolished, the amplitude and number of action potentials in a concentration‐dependent manner.”
“ Cobalt (2 × 10−3 M ) inhibited, significantly, the stimulation‐evoked overflow of 3H.”