I believe the answer is sister chromatids in a chromosome.
To be exact 23 pairs of sister chromatids.
Hope this helps .
Answer:
1. mutation and genetic recombination
The area residing in the center explains the bilatial tibulti, which precedents the bratuluti tubilitu. As for the rack itself, it has a half-moon (in laymens terms) axial, which appendages smoothly in all transition. The answer would certainty relate less to moving and a part itself, and more towards coordination or other terms (for which there are many), as this question is quite subjective.
In short, it has nearly free half-moon movement, though blocked in transition by its own quartsor axial.
The answer for this is Connective