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. 2014 Oct 6;5:516. doi: 10.3389/fpls.2014.00516

FIGURE 1.

FIGURE 1

Schematic diagram of transfer and transport processes contributing to the flow of assimilates through the source–sink system. Circles describe facilitators, squares represent symporters, triangles describe H+-ATPases/PPases, and pentagons antiporters. 1, LeSUT1; 2, LeSUT2; LeSUT4; 4, putative SlSweets. MC, mesophyll cell; PC, parenchyma cells; CC, companion cells; SE, sieve element; Suc, sucrose; SPS, sucrose-P-synthase; SPP, sucrose-P-phosphatase; CW-Inv, cell wall invertase; V-Inv, vacuolar invertase.