Please cite the main reference and the reference for the page that you are using.
oprm_human,
oprd_human,
oprk_human,
p2ry2_human,
p2ry1_human,
p2ry4_human,
p2ry6_human,
aa3r_human,
acm2_human,
acm1_human,
acm3_human,
ada2a_human,
ada2b_human,
ada2c_human
Naltrexone,
Diquafosol,
Piclidenoson,
Pilocarpine,
Brimonidine (uk14304)