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RLC phosphorylation enhances SA in partially activated cardiac trabeculae. (A) Relative trabecular length change and SL changes in micrometers (calculated from SI Appendix, Fig. S3), FSA, and <P2> changes (Δ<P2>) for E and BC probes with respect to their relaxed values (pCa 9.0) during the stretch staircase. (B) Traces at the time marked (asterisk) in A shown on an expanded time scale. Dashed lines mark the zero.
