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The green cotyledons of the dry embryo of Kochia childsii contain chlorophyll and granal chloroplasts. Epidermal chloroplasts differ from other chloroplasts of the cotyledons in having large electron-dense inclusions and a less well defined internal membrane system. Although chloroplast dimorphism is established during germination, the internal membrane systems of mesophyll and bundle sheath chloroplasts are similar ultrastructurally in the dry cotyledon.
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Marín et al. (1972) studied this question.
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