#mitosis

• Achromatin — The fundamental substance within the nucleus of a living cell, composed mainly of nucleic acids and proteins, characterized by its inability to bind basic histological dyes during laboratory techniques, remaining transparent; it forms the structural support for chromatin during cell division.
• Allocyclies — An atypical mitotic or meiotic behavior of certain chromosomes or chromosomal segments (especially heterochromatin), structurally characterized by a desynchronized rhythm of condensation and replication compared to the rest of the chromosomal complement in the nucleus; it can be positive (precocious condensation) or negative (delayed condensation).
• Amitosis — A form of direct cell division occurring through the simple cleavage, strangulation, or fragmentation of the nucleus and cytoplasm, without the individualization of chromosomes and without the formation of the mitotic apparatus (spindle). This physiological structural mechanism is considered a rudimentary method of multiplication, being specific to certain aged, specialized, or pathological cells in higher organisms, as well as many lower unicellular organisms.
• Anaphase — The third consecutive stage of the cell division process (mitosis or meiosis), structurally characterized by the abrupt separation and simultaneous migration of sister chromatids or homologous chromosomes toward the opposite poles of the cell. This mechanical and biological phenomenon, coordinated by the contraction of the mitotic spindle fibers, guarantees the perfectly equal and exact distribution of the duplicated genetic material to the two future daughter cells.
• Astrocentre — The central zone, often clear of granules, of the centrosome (cell center), located in the immediate vicinity of the nucleus of a eukaryotic cell during cell division. This structural micro-domain surrounds the centrioles and serves as an organization focal point for mitotic apparatus microtubules, coordinating the spindle formation and the correct migration of chromosomes.