Others may detach the sperm-carrying arm and leave it attached to the female. Capsules may also sometimes detach and be distributed intact, or may disintegrate after several years. A scalpel is used to detach the foreskin. It involves cadherin down-regulation so that cells can detach from laminin and migrate. The "Asteroids", sea stars, can detach limbs for self-defense and then regenerate them. They devise a plan to detach the engine from the passenger compartment. His fists can detach and fire through rocket propulsion to strike his enemies. Other zooids link to the phorozooids, which then detach themselves from the nurse. These eventually rupture and the larvae detach and are lost. The McCarthy gin used a reciprocating knife to detach seed from the lint. Alternatively, fragments detach separately as the animal creeps across a surface. Eventually, the cells become so large that they detach. It was decided to use geohydrology to detach the new polders from the mainland. Eventually, the host cells detach from the surface. This leaves room to detach the Ascended Masters from the limitations.