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Sequence of steps in somatic embryogenesis. *It has been shown by tracking of a single labeled cell that embryos can develop from single somatic cells (Schmidt et al., 1997). A multicellular origin proposed by Williams and Maheswarin (1986) to occur in some cases has not been unequivocally demonstrated. Haccius (1978) concluded that somatic embryos can derive from a single cell or proembryonal cell complexes which are derived from a single segmenting cell.
