Fig. 1

The immunofluorescence (IF) histochemistry indicates the co-existence of various opioid response factors in the myenteric plexus of a normal rat colon. (A) Representative images showing the P2Y₁ immunoreactivity; (B) the NeuN staining on the same section; (C) the co-localization of P2Y₁ and NeuN on the enteric neurons. (D) Representative IF images showing the P2Y₁ staining; (E) the MOR immunoreactivity; (F) IF image showing the co-localization of P2Y₁ with MOR. (G) Representative IF images showing the ATP staining; (H) the MOR immunoreactivity; (I) IF image showing the co-localization of ATP with MOR. Scale bars, 20 μm