Changes

'''In [[physics]],''' the central part of an [[atom]] which contains [[neutron]]s and [[proton]]s.

'''In [[physics]],''' the central part of an [[atom]] which contains [[neutron]]s and [[proton]]s.

'''In [[astronomy]],''' the bright, central part of a [[comet]];

'''In [[astronomy]],''' the bright, central part of a [[galaxy]] or [[comet]];

'''In [[meteorology]],''' the tiny grains of dust which induce water vapor to condense out into raindrops or snowflakes;

'''In [[meteorology]],''' the tiny grains of dust which induce water vapor to condense out into raindrops or snowflakes;

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[[Category:Cellular Biology]]

[[Category:Cellular Biology]]