granum

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(grā′nəm)

noun pl. grana

any of the stacks of thylakoids in a chloroplast

See granum in American Heritage Dictionary 4

noun pl. gra·na (-nə)
A stacked membranous structure within a chloroplast that contains the chlorophyll and is the site of the light reactions of photosynthesis.

Origin:

Origin: Latin grānum, seed; see grain

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