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Slime molds move, and lack chitin in their cell walls. They are now classified as belonging to the Kingdom Protista (Protoctista).

Physarum polycephalum is a plasmodial slime mold. The yellow blob we notice is a huge single cell. Unlike most cells, which have only one nucleus, this cell contains millions of nuclei. Physarum plasmodia are usually 3 or 4 cm ( ½ - 1 " ) in diameter, but can get to be 30 cm (about 1 foot) or more in diameter, and 3 to 5 cm thick. This giant cell moves, but only pictures taken over several days can show its progress. Its top speed is 1 mm per hour.

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13y ago

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