230 Plaiit Biology 



Fig. 72. — Electron micrographs of individual chloroplasts from spinach leaves, 

 showing the tiny spherical bodies, called grana, within each chloroplast. These 

 spinach chloroplasts show grana and matrix, while three grana are enlarged, 

 shadowed with gold. (From Granick, S., & Porter, K. R.: Am. J. Botany 34: 

 545, 1947.) 



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