| MR | Maddox rods; magnetic resistance; magnetic resonance; mandibular reflex; mannose-resistant; may repe... |
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| MRP | mean resisting potential; medical reimbursement plan; multidrug resistance-associated protein |
| MVR | massive vitreous reaction; microvitreoretinal; minimal vascular resistance; mitral valve replacement... |
| NAR | nasal airway resistance; National Association for Retarded [Children, Citizens]; no action required |
| nIR | non-insulin-resistance |
| epistasis, genetic | A form of gene interaction whereby one gene interferes with the phenotypic expression of another nonallelic gene or genes. Genes whose expression is altered by nonallelic genes are said to be "hypostatic" or to exhibit "hypostasis". (12 Dec 1998) |
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