Although significant bicarbonate reabsorption is achieved by principal cells in the proximal regions of the epididymis, clear and narrow cells are specialized for net proton secretion.

• 虽然碳酸氢根的重吸收是通过附睾近端的主细胞完成的，但是亮细胞和窄细胞是专门的质子分泌网络。