DRD1 and type 1 diabetes mellitus: In order to further search for specific eMNs and non-specific eMNs of T1D-DRD1 connections, we defined the specific index SP (SP = KF/AF, 0 < KF≤42, 0 < AF≤255, 0 < SP≤1), where KF is the frequency of significant eMN in the range of T1D-DRD1 connections.