MA/MyJ mice express a natural antibody to the highly oncogenic polyoma virus. C57BR/cdJ mice lack this antibody but mount an adaptive T-cell response to the virus. Analysis of F2 progeny of a cross between these strains reveals a pattern of inheritance of expression of the natural antibody involving two genes in an epistatic relationship.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3291505PMC
http://dx.doi.org/10.1534/g3.111.001701DOI Listing

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