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Summary Seedlings from 11 seed sources (lines) of American ginseng from different geographic regions were evaluated on Murashige and Skoog medium (MS) containing 10 μM α-naphthaleneacetic acid (NAA) and 9 μM 2,4-dichlorophenoxyacetic acid (2,4-D) for callus development and somatic embryo formation. Leaf and stem explants callused at a frequency of 18.2–100%, while somatic embryos were produced from...