Instead of having platelets, non-mammalian vertebrates have nucleated thrombocytes, which resemble B lymphocytes in morphology. In these cells, microtubules are nucleated from discrete sites in the cytoplasm. Microtubules are typically nucleated and organized by organelles called microtubule-organizing centres (MTOCs). However, microtubules can be nucleated from other sites as well. I proteins form a functional receptor on most nucleated cells of the body. A dispersed settlement contrasts with a nucleated village. Several variations of this hypothesis for the origin of nucleated cells have been suggested. They are produced by almost all nucleated cells. I molecules, which are expressed on all nucleated cell types. There are no nucleated villages on Kilimanjaro. Failure of the material was usually a result of undetected flaws usually nucleated during processing. The chronology of nucleated villages is much debated and not yet clear. This is determined when the crystal is nucleated and can thus be forced by seeding. The glass features a nucleated base. One example of a nucleated village in England is Shapwick, Somerset.