Definition: Spinulation is a process in which cells divide into two identical daughter cells, known as spinocytosomes. It occurs during the early stages of cell division and is essential for the formation of multicellular structures such as seeds or pollen. In plants, spinulation is particularly important because it allows for the production of pollen grains that are able to transfer pollen from one plant to another through wind or water. This process also plays a crucial role in seed development and fruit ripening.