Sale W S, Satir P
Cell Biol Int Rep. 1977 Jan;1(1):45-9. doi: 10.1016/0309-1651(77)90008-x.
In frayed axonemes of cilia isolated from Tetrahymena pyriformis, observed in negative stain, the central apparatus remains intact, stabilized in part by the sheath projections that encircle the two singlet central microtubules. The projections terminate ca. 1.5 +/- 0.5 micron before the microtubules themselves end. The microtubules are capped together at their tips by a distinct structure, the central pair cap. The cap, ca. 50 nm across and 90 nm long, consists of a stack of two disks and a ball, similar in shape to a finial. The cap is the only part of the axoneme that extends to the distalmost point of the ciliary membrane and, therefore, it may be of significance in length determination or in shaping the ciliary tip.
在从梨形四膜虫分离出的纤毛的破损轴丝中，在负染观察下，中央装置保持完整，部分由围绕两条单态中央微管的鞘状突起稳定。这些突起在微管自身末端之前约1.5±0.5微米处终止。微管在其尖端由一个独特的结构——中央对帽——连接在一起。这个帽直径约50纳米，长90纳米，由两个盘和一个球堆叠而成，形状类似于一个尖顶饰。帽是轴丝中延伸到纤毛膜最远端点的唯一部分，因此，它可能在长度确定或纤毛尖端塑形方面具有重要意义。
