6SO3:
reference: The Interacting Head Motif Structure Does Not Explain the X-Ray Diffraction Patterns in Relaxed Vertebrate (Bony Fish) Skeletal Muscle and Insect (Lethocerus) Flight Muscle., Knupp C, Morris E, Squire JM, Biology (Basel). 2019 Sep 14;8(3). pii: biology8030067. doi:, 10.3390/biology8030067. PMID: 31540109

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