Table 1. Expression of P1 and P2 receptors, and ectonucleotidases, as determined by RT-PCR.
| Genes | Resident | M1 | M2 |
| P2rx1 | − | − | − |
| P2rx2 | − | − | − |
| P2rx3 | − | − | − |
| P2rx4 | + | + | + |
| P2rx5 | − | − | − |
| P2rx6 | − | − | − |
| P2rx7 | + | + | + |
| P2ry1 | + | + | + |
| P2ry2 | + | + | + |
| P2ry4 | − | − | − |
| P2ry6 | ± | ± | ± |
| P2ry12 | ± | ± | ± |
| P2ry13 | − | − | − |
| P2ry14 | + | + | + |
| Adora1 (A1) | ± | ± | ± |
| Adora2a (A2A) | + | + | + |
| Adora2b (A2B) | ± | ± | ± |
| Adora3 (A3) | + | + | + |
| Entpd1 | + | + | + |
| Entpd2 | ± | ± | ± |
| Entpd3 | ± | ± | ± |
| Entpd8 | − | − | − |
| Nt5e | + | + | + |
The table shows gene/β-actin ratio determined after electrophoresis on a 1.5% agarose gel stained with SyberGold and visualization under ultraviolet light by using ImageJ 1.37 for Windows. Low DNA Mass Ladder (Invitrogen) was used as a molecular marker. The genes with gene/β-actin ratio ≥0.7 were considered strong expression (+), genes with ratio ≤0.3 were considered as barely detectable (±) while genes without any signal detected were considered as negative (−).