Ng S F
J Cell Sci. 1977 Jun;25:233-46. doi: 10.1242/jcs.25.1.233.
The contractile vacuole pores (CVPs) in Tetrahymena pyriformis are usually found to the left of ciliary meridians (CVP meridians). When the CVP meridians are experimentally rotated 180 degrees ('inverted'), the CVPs are now found to the right of the rotated CVP meridians. In other words, the CVP is almost invariably found on the same side with respect to the CVP meridian. Thus, the 2 sides of the CVP meridian have different morphogenetic properties and such differences are determinative in the asymmetrical fine-positioning of the CVP. The number of CVPs per animal and their general placement on the animal (i.e. with which ciliary meridians the CVPs are associated) are known to be a function of the total number of ciliary meridians possessed by the animal. Rotation of the CVP meridians affects both the number of CVPs per animal and their general placement. The specificity of such effects appears to depend on whether both, or one, or which one, of the CVP meridians is rotated. Rotation of ciliary meridians may be used as a tool in analysing the mechanism determining the number of CVPs per animal and their general placement.
梨形四膜虫的收缩泡孔（CVPs）通常位于纤毛子午线（CVP子午线）左侧。当CVP子午线通过实验旋转180度（“反转”）时，现在发现CVPs位于旋转后的CVP子午线右侧。换句话说，CVP几乎总是位于相对于CVP子午线的同一侧。因此，CVP子午线的两侧具有不同的形态发生特性，并且这种差异在CVP的不对称精细定位中起决定性作用。已知每只动物的CVP数量及其在动物身上的总体位置（即CVP与哪些纤毛子午线相关联）是动物所拥有的纤毛子午线总数的函数。CVP子午线的旋转会影响每只动物的CVP数量及其总体位置。这种影响的特异性似乎取决于两个CVP子午线、一个CVP子午线还是其中哪一个被旋转。纤毛子午线的旋转可作为一种工具，用于分析决定每只动物CVP数量及其总体位置的机制。
