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Definition: Complex of three kinds of sensory cells formed from specialization of the afferent arteriole (granular cells), the glomenulus (mesangial cells), and the distal tubule (macula densa cells) and located close to the glomerulus, where these regions of the nephron are in close apposition. The granular cells of this apparatus produce the enzyme renin.
Source: Hickman, C.P., et al. 2011. Integrated Principles of Zoology. Fifteenth Edition. McGraw-Hill Higher Education.