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| the merging of two or more cells into a single cell |
| a plant, animal, or other organism bearing an evolutionary relationship to another, often as a member of the same family |
auxotroph aux·o·troph (ôk'sə-trŏf', -trōf')
n.
A mutated microorganism having nutritional requirements that differ from those of unmutated microorganisms from the same strain.