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Drosophila centrosomes do not concentrate α/β-tubulin. Fluorescence images of mitotic Drosophila brain cells from wild-type third instar larval brains that had been cooled for 40 min on ice immunostained for alpha-tubulin (microtubules, green), mitotic DNA (blue), and Asl (centrioles, magenta). Note how there is no tubulin signal at centrosomes that is above cytosolic levels. Note also that example 1 (top panel) is the same cell as shown in Fig. 3 B, top panel.
