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SUMMARY
In darkness the unitary, elongated aggregates, or grex, of Polysphondylium violaceum are strongly attracted through air to earlier stages of development, including pre-aggregation and feeding cells. Hence the factor responsible cannot be acrasin. This attraction is dominant over mutual grex repulsion. The significance of the response is obscure. Dictyostelium discoideum cells also attract P. violaceum grex, but do not appear to attract culminating D. discoideum grex.
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