The half-maximal binding (Kd50) of the zinc transporter 8 (ZnT8)R- and ZnT8W-aa275-369 proteins, expressed in ng/ml, in each of the T1D patients (n = 12) specific for either the ZnT8RA (a) or the ZnT8WA (b), respectively. This evidence concerns the gene SLC30A8 and type 1 diabetes mellitus.