TH and sudden infant death syndrome: a.5-HT:5-hydroxytryptamine;b.ChAT:acetylcholine transferase;c.DMX: dorsal motor nucleus of the vagus; d.H.G.:hypoglossal nucleus; e.C.A.:catecholamines; f.VLM:ventrolateralmedulla;g.PNMT:phenylethanolamineN-methyltransferase; h.NTS: nucleus of the solitary tract;i.T.H: tyrosine hydroxylase;j.N.A: nucleus ambiguous; k.ICC: immunocytochemistry; l.NMDA: N-methyl-D-aspartic acid; SIDS: Sudden infant death syndrome