is glycine inhibitory
Glycine is the simplest of amino acids, consisting of an amino group and a carboxyl (acidic) group attached to a carbon atom. Glycine's function as a neurotransmitter is also fairly simple. When released into a synapse, glycine binds to a receptor which makes the post-synaptic membrane more permeable to Cl-ion. This hyperpolarizes the membrane, making it less likely to depolarize. Thus, glycine is an inhibitory neurotransmitter.