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The Transformation cog, also known as the T-cog, is the biomechanical component that enables Transformers to change form.
The Transformation cog first appeared in The Transformers, where it was featured as a component of Metroplex and Trypticon.
The IDW Publishing Transformers series established all Transformers as possessing a T-cog, the original having been created by the death of Adaptus.