Another explanation for apparent epistasis

Affiliations

• ¹ Institute of Biomedical and Clinical Sciences, University of Exeter Medical School, Exeter EX2 5DW, UK.
• ² Laboratory of Neurogenetics, National Institute of Aging, Bethesda, Maryland 20892, USA.
• ³ 1] Laboratory of Neurogenetics, National Institute of Aging, Bethesda, Maryland 20892, USA [2] Department of Molecular Neuroscience and Reta Lila Laboratories, Institute of Neurology, UCL, London WC1N IPJ, UK.
• ⁴ 1] Tuscany Regional Health Agency, Florence, Italy, I.O.T. and Department of Medical and Surgical Critical Care, University of Florence, Florence, Italy [2] Geriatric Unit, Azienda Sanitaria di Firenze, Florence, Italy.
• ⁵ Longitudinal Studies Section, Clinical Research Branch, Gerontology Research Center, National Institute on Aging, Baltimore, Maryland 21225, USA.