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| the double membrane surrounding the nucleus within a cell |
| a cell or organism that is genetically identical to the individual from which it was derived |
rostellum ros·tel·lum (rŏ-stěl'əm)
n. pl. ros·tel·la (rŏ-stěl'ə)
A small beaklike part, such as the hooked projection on the head of a tapeworm.