FIG 3.

Histamine-biosynthesis gene cluster analysis (A) and the maximum histamine production capacity (B) in histamine-producing bacteria. The phylogenetic tree was constructed based on the hdcA gene sequence of histamine-producing microorganisms. Arrows indicate open reading frames (ORFs) and transcription directions. Lines indicate intergenic regions (IGRs). *, Histamine production capacity has not been reported. Note: Information on the maximum histamine production capacity in histamine-producing bacteria is shown in Table S1.