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Scott Rolen , Bobby Abreu and catcher Mike Lieberthal form an impressive , young nucleus in their lineup and the addition of pitcher Andy Ashby will be good for another 15 wins . Likewise , the structure ( flagellum , nucleus , nucleolus , contractile vacuole , etc. ) and activity ( swimming and amoeboid motions ) of the flagellated product of germination - - the swarm cell - - can also be observed . The point that I will make today is that if you then take that cell apart and take the nucleus away , then it 's completely happy to change direction . What 's more , a proton in a nucleus with just a few other protons and neutrons behaves differently than one in a nucleus with many . This is how mass is transferred from the comet 's nucleus to its tail .