From: Chronic pain after lower abdominal surgery: do catechol-O-methyl transferase/opioid receptor μ-1 polymorphisms contribute?
Allelesa
Genotype
SNP
Chr
Position
A1
A2
MAFb
A1/A1
A1/A2
A2/A2
HWEc
rs4680
22
19951271
A (Met)
G (Val)
0.49
22 (21.6%)
55 (53.9%)
25 (24.5%)
0.55
rs1799971
6
154402490
G
A
0.10
3 (2.9%)
15 (14.7%)
84 (82.4%)
0.07