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Expression of PHYA in excised roots and hypocotyl segments in darkness. Seedlings germinated and grown for 3 weeks under 12-h light/12-h dark cycles. Organs were excised 6 h prior to transfer to constant dark. Luminescence of PHY:LUC was assayed under constant dark. Black triangles, Excised leaves. White diamonds, Excised roots. White circles, Excised hypocotyls. Hypocotyl and root values have been multiplied by 50.
