TYRO3 and Anorexia: A mutation in the signal sequence of the mouse Tyro3 gene (R7W), which resides within the critical interval that defines the anorexia (anx) mutation in anx/anx mice (Maltais et al., 1984), but is not the anx mutation itself, has been shown to be an important genetic modifier of the phenotype exhibited by these anorexic mice (Kim et al., 2017).