Which type of reins a rider uses, split reins or one rein, is a matter of personal preference. Split reins are commonly seen in the Western riding disciplines, although some Western riders might use one rein. Split reins are heavily preferred by most working cowboys and cowgirls.
Antimicrotubule agent, mitotic inhibitor Oncology An agent that inhibits cancer growth by stopping cell division Pharmacology A drug that inhibits or blocks mitosis in a particular phase of the cell cycleâeg, metaphase arrest caused by colchicine and vinca alkaloids. See Chemotherapy.
Mitosis is the division of a haploid (n) or diploid (2n) cell into two duplicate daughter cells. In a strict definition, mitosis (karyokinesis) refers to the division of a nucleus into two duplicate nuclei, each with identical sets of chromosomes.his is how the chromosome number in a life cycle changes from haploid (n) to diploid (2n). The biflagellate sperm in the above illustration is characteristic of a moss. Human sperm have a single flagellum.