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frontal-cortex

Top: Drawings of mitosis in newt cells found in W. Flemming, Zellsubstanz, kern und zelltheilung (Verlag Vogel, Leipzig, 1882). (A to J) During prophase (A to C) the chromosomes form within the nucleus from a substance termed “chromatin” because of its affinity for dyes. After nuclear envelope breakdown (D), the chromosomes interact with the two separating “centrosomes” (E) to form a spindle-shaped structure (E and F). After the chromosomes attach to the spindle, they become positioned on its equator, halfway between the two poles (G). Once this “metaphase” stage is achieved, the two chromatids comprising each chromosome disjoin and move toward the opposing poles (G and H). During the final stages of mitosis, neighboring chromosomes within the two groups fuse to form the daughter nuclei (H and I), and the cell becomes constricted between them (I) by cytokinesis. (J) Drawing from Schrader’s (2) book depicting conspicuous chromosomal (kinetochore) fibers during early anaphase inLilium.

Bottom: (A to H) Fluorescence micrographs of mitosis in fixed newt lung cells stained with antibodies to reveal the microtubules (green), and with a dye (Hoechst 33342) to reveal the chromosomes (blue). The spindle forms as the separating astral MT arrays, associated with each centrosome (A to C), interact with the chromosomes. Once the chromosomes are segregated into daughter nuclei (F and G), new MT-based structures known as stem-bodies form between the new nuclei (G). These play a role in cytokinesis (H).

Source : Rieder C.L. & Khodjakov A.; Mitosis Through the Microscope: Advances in Seeing Inside Live Dividing Cells; Science  04 Apr 2003:Vol. 300, Issue 5616, pp. 91-96 DOI: 10.1126/science.1082177

Source: science.sciencemag.org
serious-goose
  • The Great British Baking Show: Everybody have fun :) :) I'm sure you'll all do fine :) Your Swiss roll is so lovely :) :) :) Very nice :))) *Light ballet music*
  • Any American Cooking Show: YOU GUYS HAVE SIX SECONDS LEFT THEN THE BOMB E X P L O D E S *Gunfire* YOU THINK THAT COUNTS AS FOOD YOU PATHETIC SAD SACK *Ride of the Valkyrie blasting in the background* ILL SEND A BULLET THROUGH YOUR SKULL BEFORE I TAKE A BITE OF THAT *Banshee shriek*