To nucleate the assembly of branched actin filaments, Arp2/3 needs to be activated by a nucleation promoting factor (NPF)

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gp 80 – form tight aggregate

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gp 150– help in migration of slug

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Adenylate cyclase A (ACA), is responsible for the synthesis of cAMP.

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For stalk and spore maturation, cAMP is produced by adenylate cyclase R (ACR)

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ACR harbours seven transmembrane domains and is embedded in the nuclear membrane of prestalk cells.

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For induction of prespore differentiation and control of spore germination cAMP is produced by adenylate cyclase G (ACG)