Lamin B is a type of protein that plays a crucial role in maintaining the structure and stability of the cell nucleus. It is part of a group of proteins known as lamins, which form a mesh-like network called the nuclear lamina. This network provides support to the nuclear envelope, helping to organize the genetic material within the nucleus. There are two main forms of Lamin B: Lamin B1 and Lamin B2, which are encoded by different genes. These proteins are essential for various cellular processes, including cell division and gene expression. Mutations in the genes encoding Lamin B can lead to various diseases, including muscular dystrophy and progeria.