The most common childhood forms of Batten disease result from mutations in either CLN1 (Classic Infantile Neuronal Ceroid Lipofuscinosis; cINCL; Haltia–Santavuori), CLN2 (Classic Late-Infantile Neuronal Ceroid Lipofuscinosis; cLINCL; Janský–Bielschowsky) or CLN3 (Classic Juvenile Neuronal Ceroid Lipofuscinosis; cJNCL; Spielmeyer–Sjögren). The gene discussed is CLN3; the disease is juvenile neuronal ceroid lipofuscinosis.