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Heaton, H. J.; Whitkus, R.; Gómez-Pompa, A. (1999). Extreme ecological and phenotypic differences in the tropical tree chicozapote (Manilkara zapota(L.) P. Royen) are not matched by genetic divergence: a random amplified polymorphic DNA (RAPD) analysis. Molecular Ecology. 8(4): 627-632.