Akkermansia Article Butyrivibrio Daphnia Daphnia magna Dopamine synthesis Gut microbiome Host-microbiome interactions Interkingdom communication L-Dopa Molt cycle and development Peripheral pathways for neurotransmitters Pseudomonas RNA 16S animal experiment aromatic levo amino acid decarboxylase bacterial growth bacterium culture catecholamine community structure concentration (parameter) controlled study decarboxylation dopamine dopamine metabolism gene expression host microbe interaction hydroxylation immunohistochemistry in vitro study