中型弹跳虫对培养基中铁蛋白的摄取。

Experientia. 1977 Dec 15;33(12):1595-8. doi: 10.1007/BF01934018.

Tokophrya infusionum, a suctorian, is deprived of a mouth opening. The uptake of ferritin from the medium is accomplished through pits, invaginations of the plasma membrane which are permanent structures. From the pits containing ferritin, flat vesicles are pinched off transporting the ferritin to the cytoplasm.

吸管虫类的输液管吸管虫没有开口。它从培养基中摄取铁蛋白是通过凹陷来完成的，凹陷是质膜的内陷，是永久性结构。从含有铁蛋白的凹陷处，扁平小泡被掐断，将铁蛋白运输到细胞质中。