NOS2 and Parkinson disease: Hancock et al. studied the associations of 27 NOS1 SNVs (see Section 2.1.4 on “Parkinson’s Disease” regardingNOS1); 18 NOS2 SNVs (see Section 2.3.3 on “Parkinson’s Disease” regardingNOS2); and 5 NOS3 SNVs, namely rs1800783, rs1549758, rs1799983, rs3918227, and rs1808593, with a risk of PD in 337 families with sporadic PD from the USA and 358 families with familial PD.