What is the process of the regeneration of starfish?

Some species of starfish have the ability to regenerate lost arms and can re-grow an entire new arm in time. Most species must have the central part of the body intact to be able to regenerate, but a few can grow an entire starfish from a single ray. Included in this group are the red and blue Linckia star. The regeneration of these stars is possible due to the vital organs kept in their arms.