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Burst pressure of silk microtubes as a function of microtube treatment. Internal pressure of the microtubes was increased by flowing water through the microtube, keeping one end of the flow loop closed. Pressure at point of failure was recorded with a digital manometer (n=5–6). * indicates P<0.05 with PEO20; ** indicates P<0.01 with PEO10, PEO20 (two-sample t-test).
