Hyperphenylalaninemia, Mild, Non-Bh4-Deficient, is also known as hyperphenylalaninemia due to dnajc12 deficiency. An important gene associated with Hyperphenylalaninemia, Mild, Non-Bh4-Deficient is DNAJC12 (DnaJ Heat Shock Protein Family (Hsp40) Member C12). Affiliated tissues include brain, and related phenotypes are global developmental delay and dystonia