Keywords: SCL30A2, solute carrier family 30 member 2; SLC39A4, solute carrier family 39 member 4; TNZD, transient neonatal zinc deficiency; Zip4, zinc/iron-regulated transporter-like protein 4; ZnT-2, zinc transporter-2; acrodermatitis enteropathica; dermatitis; mineral deficiency; nutritional disorders.