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| reversion to an earlier or less advanced state or form or to a common or general type |
| a sudden departure from the parent type an heritable characteristic caused by a change in a gene or a chromosome |
axenic a·xen·ic (ā-zěn'ĭk, ā-zē'nĭk)
adj.
Not contaminated by or associated with any other living organisms; sterile. Used especially in reference to pure cultures of microorganisms.