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an allelic gene that is considered as being normal but can be distinguished from another allele by its differing phenotypic expression when in combination with a dominant mutant allele.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
One of a number of alleles that can be distinguished only by special analyses.
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