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Epitypes of Picea abies a Somatic embryos cultured at 18 °C. Bar 1 mm. b Forest plantation of epitype trees generated from somatic embryos exposed to epitype-inducing temperature conditions. c Epitypes under identical spring conditions showing marked phenotypic differences in timing of bud burst-related to epigenetic memory of cold (CE; 18 °C) and warm (WE; 28 °C) temperature conditions during embryogenesis
