Lamins are nuclear membrane structural components that are important in maintaining normal cell functions, such as cell cycle control, DNA replication, and chromatin organization. Lamins have been subdivided into types A and B. Type-A lamins consist of lamin A and C, arising from alternative splicing. Lamin A and C are cleaved by caspases into large (41-50 kDa) and small (28 kDa) fragments, which can be used as markers for apoptosis. Type-B lamins consist of lamin B1 and B2, encoded by separate genes. Lamin B1 is also cleaved by caspases during apoptosis. Research studies have shown that duplication of the lamin B1 gene is correlated with the pathogenesis of the neurological disorder adult-onset leukodystrophy. Synonyms: ADLD, LMN, LMN2, LMNB, MGC111419, Lamin B1