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			| Secretory Cavities and Canals | 
		
			| Curtis, Lersten, and Nowak 2002 rev. 2015 | 
		
			| Persicaria hydropiper (water-pepper) leaf with surface torn to expose the four epithelial cells around an epidermal cavity (SEM). Curtis and Lersten. 1994. New Phytol. 127: 761-770.
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