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Passive tension and signal-to-noise ratio (SNR). (A) A trace of passive tension obtained from the bath medium without tissue. To determine the degree of system noise in the measurement, the bioengineered tissue was attached to the measurement system with no external stretch. (B) Active tension tracing. The SNR of the system, representing the degree of active tension is the ratio of mean signal strength to the standard deviation of the noise. SNR = ∼250 units.
