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amyloplast

am·y·lo·plast [ ámməlō plàst ] (plural amy·lo·plasts)


noun 
Definition:
 
starch storage sac in plant cells: a microscopic sac, bound by a double membrane, that is found inside plant cells and contains starch granules. In some tissues, e.g. the root tip, amyloplasts are highly mobile within the cells and may function as gravity detectors.

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