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Optical image of the cross section of a mature soybean seed along the embryo axis and through a cotyledon (a); magnified germ region of seed (b) with shoot meristem (shm), hypocotyl region (hyp), seed coat (sec), central cylinder (cec), vascular system (vas), root parenchyma (rop), root meristem (rom), and cotyledon section (cot)
