Figure 1.

Representative ¹⁴C autoradiographs illustrating active loading and passive loading in the minor veins. Discs were cut from abraded leaf tissue and floated on [¹⁴C]Suc (s), [¹⁴C]mannitol (m), or [¹⁴C]sorbitol (so) for 1 h, flash frozen, lyophilized, and autoradiographed.