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I am reading an article about the mTOR signalling pathway and I have come across the following:

mTOR nucleates at least two distinct multi-protein complexes, mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2).

I am not sure what is meant by "mTOR nucleates 2 multi-protein complexes". From the paper, I understand that mTOR is a component of the mTORC1 and mTORC2 complexes. I have read the definition of 'nucleate' online and it means to either "to form into a cluster" or "to act as a nucleus for". However in the context of this article, I am not clear about what is meant by "nucleates" in the above statement. Any insights are appreciated.

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Here nucleation has a rather physical meaning. mTOR acts as the starting assembly point of the complex.

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