Lamins are a type of protein that form a dense network inside the nucleus of eukaryotic cells. They provide structural support and help maintain the shape of the nucleus, acting like a scaffold. Lamins are essential for various cellular functions, including DNA replication and cell division. There are two main types of lamins: lamin A and lamin B. These proteins are part of the nuclear lamina, a layer that lies just beneath the inner nuclear membrane. Mutations in lamin genes can lead to various diseases, including muscular dystrophy and progeria, which affect cell stability and function.