However, recent research has shown that at least some prokaryotes have [[Bacterial microcompartment|microcompartment]]s such as [[carboxysome]]s. These subcellular compartments are 100–200 nm in diameter and are enclosed by a shell of proteins. Even more striking is the description of membrane-bound magnetosomes in bacteria. as well as the nucleus-like structures of the "Planctomycetes" that are surrounded by [[Lipid bilayer|lipid membranes]].