Color-enhanced Transmission Electron Micrograph (TEM) of longitudinal section of stoma of Timothy Grass (Phleum pratense), showing two long guard cells with elongate nuclei, dense cytoplasm and small photoreceptor chloroplasts which lie on either slide of the slit-like pore (blue); two subsidiary cells have large vacuoles. Magnification x8000. (KEYSTONE/SCIENCE SOURCE/BIOPHOTO ASSOC.)
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