Proteins are made in the cytoplasm on the class of ribosomes. In the nuclear protein targeting pathway, the signal sequence tells them to go to the nucleus. These proteins contain a region called the signal sequence, followed by bonding of an initial bond to a cytoplasmic protein called (very specific name), and then bonding of a protein called (very specific name) to form a dimer. The dimer is then passed to the nuclear protein (very specific name), resulting in the formation of a trimer. The trimer enters the nucleoplasm through a channel in the nuclear membrane. The trimer binds to the nucleoplasm, and the molecule (name) is released. Once inside, the two cytoplasmic proteins immediately bind to the trimer, driven by a concentration gradient in proteins. The trimer is concentrated on the side of the nuclear membrane. The molecule binds to the trimer and is transported to its destination. The major function of these proteins is (describe). Specifically, lamins are found in the nucleus of cells.