in projection neurons. Blocking of voltage-sensitive Ca 2+ currents transformed the N-shaped voltagedependency into a linear one, indicating activation of calcium-dependent K + currents (IK,Ca). The densities of currents through voltage-sensitive Ca 2+ channels did not differ between the two neuron classes and the voltagedependency of current activation was similar. Projection neurons thus express higher calcium-dependent K + currents. These analyses revealed that the various neurons of the

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... ybee olfactory pathway in vitro have different current phenotypes, which may reflect functional differences between the neuron types in vivo.