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An exact heterotic string theory on an AdS2xS2 background supported by anelectromagnetic flux is found as a marginal deformation of an SL(2,R)xSU(2) WZWmodel. Based on a talk given at NATO Advanced Study Institute and EC SummerSchool on String Theory: from Gauge Interactions to Cosmology, Cargese,Corsica, France, 7 Jun - 19 Jun 2004.Comment: 5 page

ADS2 × S2 as an Exact Heterotic String Background