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Cell's body suction is a term used to refer to Dragon Ball Z character Cell's ability to stab victims with his tail and absorb their biomass (also known as "bio extraction").
This is used to increase his power in his Imperfect Cell form.
The move can be used in all of his stages, but he had no need to do it anymore because he had already gained enough strength.
It is unknown whether or not a victim's soul is absorbed in this process.
Cell seems to be able to mimic those that he absorbs, in that he can use their voice and mimic their personalities (and modify them as he sees fit).