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Figure 5 (A–C) Histamine 1 receptor (H1R) mRNA expression (A), H2R mRNA expression (B), and H4R mRNA expression (C) in biopsy samples from patients with irritable bowel syndrome (IBS) tested positive for food allergy (FA) (n = 19), tested negative for FA (n = 11), and from control subjects (n = 14), measured by quantitative reverse transcription‐polymerase chain reaction. H3R mRNA was only detected in two samples. (Methods and data presentation as in fig 1.)
