Immunoblot, immunohistochemistry, Northern blot, and PCR analyses reveal CLN3 protein and mRNA expression in the nervous system, glandular/secretory system, skeletal muscle, gastrointestinal tract, and cancer tissues (Chattopadhyay & Pearce, 2000; Margraf et al., 1999; Persaud‐Sawin, McNamara, Rylova, Vandongen, & Boustany, 2004; Rylova et al., 2002). Here, CLN3 is linked to cancer.