Nucleation phase 

Lag period (Time taken for nucleation) Rate-limiting Step.

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IFN- ¥ has been shown to induce expression of the class II transcriptional activator (CIITA). 

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For optimal activity, of acid hydrolases they need to be: Activated by proteolytic cleavage Requires an acid environment.

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Formins are activated by membrane-bound Rho-GTP, a Ras-related small GTPase

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NodD proteins interact directly with the signals generated by the plants and activates most conserved Nod ABC genes in bacteria

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Amphitelic attachment, 

sister kinetochores attach to microtubules emanating from opposite spindle poles, they are stably attached