Contraction-Band Formation in Barnacle Myofibrils

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Science  10 Jan 1964:
Vol. 143, Issue 3602, pp. 134-136
DOI: 10.1126/science.143.3602.134


Contractions induced by adenosine triphosphate, in myofibrils isolated from the barnacle, Balanus aquilia, were observed with a phase microscope. The formation of contraction bands was well under way before the A-band came into contact with the Z-membrane. This is in disagreement with the hypothesis that contraction bands are formed when the A-band pushes against the Z-membrane.