segmentation clock in a sentence

1. Further studies identified the role of Notch signaling in the segmentation clock.
2. When the notochord is ablated during somitogenesis in the chick embryo, the proper number of somites forms, but the segmentation clock is delayed for the posterior two-thirds of the somites.
3. For example, in the development of the repeating blocks of somites in the mesoderm of vertebrate animals, even though the biological system may be subject to a noisy environment, the segmentation clock maintains periodic gene expression through coupled oscillators, in which synchronous oscillation of neighbors is maintained through mutual coupling.
4. It's difficult to find segmentation clock in a sentence.