INHA and neoplasm: In mice, genetic deletion of the Inha gene (Inha KO) results in testicular enlargement (Figures 1A,B), and development of focally invasive tumours by approx. 4 weeks of age (Figure 1A, arrow) (Matzuk et al., 1992; Matzuk et al., 1994; Coerver et al., 1996).