Glycine is the only inhibitory neurotransmitter present. He likely has glycine encephalopathy is a rare autosomal recessive neurological disorder. Tetanus toxin - blocks release of inhibitory NT's gaba and glycine. Botulism - 'floppy baby ate honey' - inhibition of ACh release at the neuromuscular junction.
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Here is more about glycine encephalopathy, which presents like the stem: https://ghr.nlm.nih.gov/condition/glycine-encephalopathy