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Somatic embryo production of 21 embryogenic lines of Norway spruce following 4, 8, or 12 months in continuous proliferation, or following cryopreservation at age of 4 months, thawing, and further proliferation for 2 months, n = 252. Number of embryos produced per gram of fresh weight (gFW) of embryogenic tissue with standard error are shown. The group means that differ significantly from each other (Student–Newman–Keuls multiple range test, p < 0.05) are marked by different letters.
