During morphological research of cell mitotic chromosomes the secondary constriction was revealed. It separates the end area of the chromosome shoulder. What is the name of this part of the chromosome?

During morphological research of cell mitotic chromosomes the secondary constriction was revealed. It separates the end area of the chromosome shoulder. What is the name of this part of the chromosome?

1.  Nuclear matrix protein


2.  Microtubule of mitotic spindle


3.  Kinetochore


4.  Primary constriction of chromosome


5.  *Chromosome's satellite