When food is abundant , the cellular slime mold Dictyostelium secretes cAMP into the environment to signal the formation of a multicellular slug-shaped colony.
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cAMP

Cyclic Adenosine Monophosphate, a second messenger important in many biological processes, including the activation of protein kinases.

Cellular Slime Mold

A group of funguslike amoebozoan protists whose feeding stage consists of unicellular, amoeboid organisms that aggregate to form a pseudoplasmodium during reproduction; compare with plasmodial slime mold.

Dictyostelium

A genus of amoebae that are used as model organisms in molecular biology and genetics.