Which of the following statements about the molecular arrangement of actin in myofibrils is incorrect?
(1) Each actin (thin) filament is made of two ‘F’ (filamentous) actins helically wound to each other.
(2) Each ‘F’ actin is a polymer of monomeric ‘G’ (Globular) actins.
(3) Two filaments of another protein, tropomyosin also runs close to the ‘F’ actins throughout its length.
(4) A complex protein troponin is distributed at regular intervals on the tropomyosin.
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