Proximal tubule Proximal tubule Proximal tubule Proximal tubule Proximal tubule Proximal tubule Proximal tubule Full article >>> Proximal tubule Proximal tubule Proximal tubule TUBULE (1D. Tiny biological channel, as in the kidney) Proximal tubule Proximal tubule Full article >>> Proximal tubule Proximal tubule Proximal tubule proximal tubule