The authors are at the Volen Center, Brandeis University, Waltham, MA 02454−9110, USA. marder@brandeis.edu
A new study in this issue demonstrates that two GABAergic motor neurons in C. elegans are excitatory at target muscles because GABA activates a ligand-gated cation conductance, which is structurally similar to several other ligand-gated channels.
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