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For a root system $\Phi$ of type $E_l$ and arbitrary commutative ring $R$ weshow that the group $K_2(\Phi, R)$ is contained in the centre of the Steinberggroup $St(\Phi, R)$. In course of the proof we also demonstrate an analogue ofQuillen---Suslin local-global principle for $K_2(\Phi, R)$.

On centrality of $K_2$ for Chevalley groups of type $E_l$