“The degree of inhibition by dopamine and (+)‐SKF38393 depended on transmembrane voltage, increasing … times with a hyperpolarization of about 80 mV. The voltage‐dependent block by dopamine was also observed … presence of MgCl2 1 mM. Single‐channel recordings showed that the … of NMDA‐gated channels were shortened by (+)‐SKF38393.”