SUMMARY: Techniques used previously to examine the mitotic chromosomes of have been applied to the cellular slime mould Mitosis in is similar to that in except that a metaphase plate configuration is rare and that it has more chromosomes ( = 11 or 12) than ( = 7). Some metaphase arrest (mitotic index 14 %) was achieved in when colchicine was used at a high concentration (10 mg ml). Low concentrations of benzimidazole derivatives (thiabendazole, cambendazole, ben late and nocodazole) caused the arrest of cell division, mitotic indices greater than 50%, chromosome doubling and lowered plating efficiency. Growth of in axenic medium was investigated.


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