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The mitochondrial membrane segment of respiratory chain complex I. Respiratory chain complex I is an enzyme of the respiratory chain, consisting of at least 34 polypeptide chains. The electrons of NADH enter the chain at this complex. The complete complex is L-shaped, with a horizontal arm lying in the membrane and a vertical arm that projects into the matrix. [GOC:jid, GOC:mtg_sensu, ISBN:0716749556]
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